Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ac074db1ea27b…

MALICIOUS

PDF

36.7 KB Created: 2020-08-05 15:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5161c099a0592a948cd7a019609ed65 SHA-1: 9710d7f45fe70b29e86ce31d364c8bf7e50bcc86 SHA-256: 5a8ac074db1ea27b22eb4b67d9e23b98c2321684b09488d0c2baf2903686c496
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains the primary malicious URL and numerous other links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=radiation+heat+transfer+a+statistical+approach+pdf
    • http://files.winterhomeschoolconference.com/uploads/1/3/1/4/131437655/xekekasiril-sedusudorawap-mifeniwetipomas-dinuwidutakezux.pdf
    • http://files.scfcommunity.org/uploads/1/3/0/8/130814923/rexikofovita_senakenav_dalen.pdf
    • http://files.marriedbythebeard.com/uploads/1/3/2/6/132695455/fabavivaneferiwuf.pdf
    • http://files.mikejdonovan.com/uploads/1/3/1/3/131379296/tukifotozijudawip.pdf
    • http://files.bcbsca.org/uploads/1/3/0/8/130874566/vubudoz-wifevukufigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/97713874807.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/vonezagobevenefifawuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1665/files/revolutionary_armed_struggle.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/enter_the_gungeon_brick_of_cash.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/52977267683.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/gavejas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/67224258679.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0439/4287/1208/files/58109398855.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/veneluboxesuzon.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/66320001978.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/lelusopoxinotol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/expedient_homemade_firearms.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_off00004f5d.bin
7b46aae4e99abac37c8732c165c96bfd37f404649c8067165095d41ecd7d1340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5D 5248 bytes
font_01_sfnt_off00006138.bin
84ab6fe4d5d4e5e3622e44d73f7be00c30d836623d5b5c3fe0c59d101608ff41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6138 10064 bytes

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