Malicious PDF — malware analysis report

Static analysis result for SHA-256 4768cc40eb7d5008…

MALICIOUS

PDF

45.9 KB Created: 2020-07-16 01:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 861ac26ee516cf61da5de01245200ca5 SHA-1: 5d1711af7b5f54169fd0bbf72a02404433f6deba SHA-256: 4768cc40eb7d50083dc9d4104809d087fc6163ed80661633bc40b10e868a22d2
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with one URL pointing to known malicious infrastructure. The ML classifier also strongly flagged this PDF. While no scripts were extracted, the presence of embedded links and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=how%20to%20convert%20a%20pdf%20document%20into%20a%20powerpoint%20presentation In PDF document text
    • http://files.rone.studio/uploads/1/3/1/3/131379266/gopijiwupevutekifari.pdfIn PDF document text
    • http://files.cuamusic.com/uploads/1/3/0/7/130738841/2676145.pdfIn PDF document text
    • http://files.drumcrimewatch.com/uploads/1/3/1/4/131452806/8362254.pdfIn PDF document text
    • http://files.lovelaurenalexa.com/uploads/1/3/1/8/131856531/binupaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/zazaxewejulumevagufip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/riseravukudukuf.pdfIn PDF document text
    • https://virebon.files.wordpress.com/2020/06/36662854198.pdfIn PDF document text
    • https://mixowunajux.files.wordpress.com/2020/07/67096934795.pdfIn PDF document text
    • https://buvixewumus.files.wordpress.com/2020/06/batufepidewexabikitexod.pdfIn PDF document text
    • https://puroxil.files.wordpress.com/2020/07/97106472375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/xotedozurotizisebigojirik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/jafaxanusebikeserivite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/8989746292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/togotonawesidifananizuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3839/1970/files/86422824230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0266/6914/files/wuretevexefasavirore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/50692879073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/43281889150.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FA 5264 bytes
SHA-256: 291f153440db9638aa3430da420ceb5b110960bed335810dbab4aba7d1539bf4
font_01_sfnt_off000087d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D3 9800 bytes
SHA-256: b94f2b8bb2f19b6d08832040584f163fd58bd415ef7c3563ccc03094c6fcde55