Malicious PDF — malware analysis report

Static analysis result for SHA-256 599043179de4d6bb…

MALICIOUS

PDF

45.8 KB Created: 2020-07-21 03:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: cfffcf48e3733c865742f5793b271ddf SHA-1: 6f7ab4483a630f9c26fc3d05092544516dc88191 SHA-256: 599043179de4d6bb15adaf462440f0ca553f41c417d659095f448a5e7706e0d3
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 designed to host numerous PDFs. The document body, though heavily obfuscated, contains text suggesting a 'download read only pdf online' lure, reinforced by the 'SE_DOWNLOAD_BUTTON' heuristic. The primary malicious URL identified is https://ttraff.cc/wb?keyword=download%20read%20only%20pdf%20online, which is flagged as a known malicious redirector.

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.cc/wb?keyword=download%20read%20only%20pdf%20online In PDF document text
    • http://files.chapelatmercer.com/uploads/1/3/1/3/131383510/vapikiwebodol.pdfIn PDF document text
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdfIn PDF document text
    • http://files.sage-and-selah-organics.com/uploads/1/3/1/6/131637218/bewadi.pdfIn PDF document text
    • http://files.ridethai.com/uploads/1/3/1/8/131856883/lexigutivozizat_xomonobajuxu.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/1/0427/6633/6167/files/waratixamesixoduge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/91757212174.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/95910026560.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3096/8480/files/75381771285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83390791822.pdfIn PDF document text
    • https://texiduga.files.wordpress.com/2020/07/sumitesa.pdfIn PDF document text
    • https://wajerenedage.files.wordpress.com/2020/07/gakegopefetuxevemotebim.pdfIn PDF document text
    • https://wunufapozo.files.wordpress.com/2020/07/xeburebamifapadokora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4135/6950/files/danojukejekedalujuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/51885796803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/getidezusonajimanenagazu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/56817526459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/67358560112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8439/8236/files/49861883717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/zunijafavubo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/67290382946.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_off00007665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 4756 bytes
SHA-256: caa9849394192e0c14f2238df78c2c1bc37e14725ec1a431c7fa8d791eb1ef26
font_01_sfnt_off000086ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AD 10548 bytes
SHA-256: 7c817a8f91fcb2a41d79774fb97ed7b34a30dd2ccac799fb9d51e0f6a5314da7