Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39a469df947fb29…

MALICIOUS

PDF

50.5 KB Created: 2020-07-23 13:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 2f1539097cb37f1106fa677c6248c8fc SHA-1: e28453e58de62f86644c8fb648b4992b55888ec8 SHA-256: c39a469df947fb29b8140adeb0b7c4d8792b5f0e83a4a5ede30d18d1c538bb85
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet answers' document. The ML classifier strongly indicates maliciousness, and the presence of a redirector link supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=race%20to%20ratify%20icivics%20worksheet%20answers In PDF document text
    • http://files.mustardseedthriftonline.com/uploads/1/3/0/7/130740521/nelidejodata.pdfIn PDF document text
    • http://files.crossfitunsung.com/uploads/1/3/1/3/131380850/3719005.pdfIn PDF document text
    • http://files.studiobarcelonamke.com/uploads/1/3/1/4/131407214/9c5cf28473058.pdfIn PDF document text
    • http://files.thearborsatparsippany.com/uploads/1/3/2/6/132681743/d74e30308e6e6.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/1/0430/9945/5642/files/867358305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/tamasotedepiwujifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/zunopetew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/dejewone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/98129527160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/fopotamojojeliv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/lunijomozesomuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/26038210584.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/779754975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/4379837933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/kejodizuliviniji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/tasikoberufowis.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000879c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879C 5052 bytes
SHA-256: 145bfd456c5056219ed8d05e07356f21db58902dfb13fc5bbd0807319efcaf19
font_01_sfnt_off000098d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98D6 10440 bytes
SHA-256: 11d501e3bd5b7479875f53022752a8a5a1f54382c0ad91b94b6241fe2deb6db9

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