Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4fe6de5e73b409…

MALICIOUS

PDF

44.8 KB Created: 2020-08-13 07:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa15bcefebc55a9792b10fd3d3e7848c SHA-1: a2c109bfe2650f10cdc6decab9f1a5eab570a910 SHA-256: 7b4fe6de5e73b409a086c0cd218139b467f7f1102b43fa14d5a7ce102f604be9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains references to these URLs, suggesting the intent is to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=que+es+la+neoliberalismo+pdf
    • http://files.prostatecurefoundation.com/uploads/1/3/2/6/132695707/pezuvuvefovasuziki.pdf
    • http://besixon.faceeffect.shop/uploads/1/3/1/4/131452938/cd10d.pdf
    • http://waxamo.humanesocietygreenecounty.com/uploads/1/3/1/4/131437987/2f73934f5af5438.pdf
    • http://files.americanpolicenews.com/uploads/1/3/2/8/132814147/japemebebogotis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/arresting_communication.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/peer_gynt_ibsen.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/10_luck_20_skill.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/gefilemenet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5658/7174/files/minecraft_tower_defense_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5938/8320/files/49106930993.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/d_d_5e_urban_bounty_hunter.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/sony_wi-_1000x_vs_bose_qc30.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2279/4395/files/bozudikalesif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/best_arabic_to_word_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0447/0633/2825/files/abc_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/zamawufabawomuxigize.pdf
    • https://cdn.shopify.com/s/files/1/0433/5874/8822/files/73418851100.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd2.bin
b284332b803590ecc6646ec2356a209306e97c9317a6c597dfdf1ed0297d5132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD2 5388 bytes
font_01_sfnt_off00007ffc.bin
729b0989b0e1bdcb2e2fe2172d7a8531500ae6c8083e1a1c04fd87da18a23e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFC 11356 bytes

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