Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c495a9c8c3082fc…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 21:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d61c0fdd0a63cfb551ec3b52ec08009 SHA-1: b477da0fb07c2cbaa869613c37d7f4bc0f9ddfdc SHA-256: 5c495a9c8c3082fcaa21c6f260b94c1360ebf650d13fb2580cff4759c456b8bd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One prominent link, disguised as a resource for "child development and psychology questions and answers pdf", leads to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the malicious redirector indicate a phishing or 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.cc/wb?keyword=child%20development%20and%20psychology%20questions%20and%20answers%20pdf
    • http://files.deathcog.com/uploads/1/3/0/7/130775245/11c07.pdf
    • http://files.lilgothlivepicture.com/uploads/1/3/0/7/130738912/9506902.pdf
    • http://files.scrollsawaustralia.com/uploads/1/3/1/4/131453022/fanati.pdf
    • http://files.moraystore.com/uploads/1/3/0/7/130739616/5950678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/rigin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/beloved_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0447/4185/3333/files/3_phase_bldc_motor_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/97843517607.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4207/files/behavioral_economics_for_dummies_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/58388208765.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/dezoxetazipaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7696/files/tubosajujusamubawuxeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/53628422390.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/bowowilurosemurari.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/bavufatobusubuxuwusozura.pdf
    • https://cdn.shopify.com/s/files/1/0431/4618/2822/files/44566715063.pdf
    • https://cdn.shopify.com/s/files/1/0434/5059/7528/files/ubuntu_webcam_server.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/xurasizafiw.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_off00006db8.bin
1a789e5d4cc87b8f899d08fd594bc9f99cd4d6669a0e66f23f7ef43e2ecfcb20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 5856 bytes
font_01_sfnt_off00008191.bin
281a353936cc7036ea636aac6d276624f9f879b823bbbaeb80bf2157238a2bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8191 10332 bytes

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