Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c13e61f3b0ec08…

MALICIOUS

PDF

43.5 KB Created: 2020-08-25 11:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72795b24fd44782739542a4085b21b6c SHA-1: cb5ce29cbe7da957a1b58cd4409096978bba2b65 SHA-256: 85c13e61f3b0ec08708a2ce9a05d23f38ba20af0e9eda909219cfc1c59282754
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to its inclusion of a large number of external links, many of which point to PDF files hosted on various domains. One of the primary links, 'https://ttraff.com/pify?keyword=cousin+marriage+leave+format', is identified as a malicious redirector. This suggests a link-farming or SEO manipulation tactic, potentially leading users to malicious sites or phishing pages. No scripts were extracted, but the presence of numerous links and the malicious redirector indicate a high likelihood of a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=cousin+marriage+leave+format
    • http://lofuxa.filipemiguelart.com/uploads/1/3/1/4/131453060/887796.pdf
    • http://dusame.insightsjh.com/uploads/1/3/1/4/131438316/4196192.pdf
    • http://files.norstarindustries.ca/uploads/1/3/2/7/132710565/6924308.pdf
    • http://files.margaretdyer.org/uploads/1/3/1/4/131482828/75d0c45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3092/9827/files/mufiwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/51600084513.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/rogijogadami.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/kopofuziregebusezuduvab.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/conducting_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/reretunuzuwegosakamofut.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/89632106962.pdf
    • https://cdn.shopify.com/s/files/1/0448/5634/4737/files/43343969481.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/16604417757.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/jorelisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/tazenopetinoginelufajel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/sajigusudak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dfc.bin
0d74fdcdf5a8678ea060c2400cc9bfae0fe4242a88bfbd9452a11c3c1071123a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFC 5052 bytes
font_01_sfnt_off00007f18.bin
c2d86ea8ec191646cc1e5c96267e0122c257608d8161e5f15b4dc6485309a380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F18 9904 bytes

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