Malicious PDF — malware analysis report

Static analysis result for SHA-256 641dd30be0713067…

MALICIOUS

PDF

53.4 KB Created: 2020-08-14 04:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d684c078969b1c77beda4d39656ded1 SHA-1: ae8bde6d119740e2f3ec0ce88627193dc709c82a SHA-256: 641dd30be0713067af36307e6f556553bcb73c464cff9642c1729fd82a314c46
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to external resources, suggesting an SEO poisoning or link farm attack. One prominent URL, 'https://ttraff.ru/wb?keyword=dna%20structure%20and%20replication%20crash%20course%20biology%20#10%20worksheet%20answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the topic and the malicious URL, reinforcing the lure.

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/wb?keyword=dna%20structure%20and%20replication%20crash%20course%20biology%20#10%20worksheet%20answers
    • http://sijifuken.thepurplebowteaneck.com/uploads/1/3/1/3/131398521/2b19f52f02772a.pdf
    • http://files.missioncombat.com/uploads/1/3/1/4/131453198/jikav_zizositunere.pdf
    • http://files.mymandatups.com/uploads/1/3/1/4/131482962/6833951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/77615183852.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/gewixetitor.pdf
    • https://cdn.shopify.com/s/files/1/0439/5371/7406/files/xusawatoxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/sexubezagamajekiketorukaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/83705642857.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/wrist_exercises_for_carpal_tunnel.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/physics_class_11_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/you_won_t_relent_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/21299015160.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/xavufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/pinch_of_nom_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/base64_encode_to_php.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/punctuation_worksheet_for_grade_1.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_off0000918b.bin
b1a1509845bf1bde36fe54a15c40bf781d949c080a707a844d7bb9072d8ac693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918B 5576 bytes
font_01_sfnt_off0000a476.bin
858b81ce0a75e0be253a0aa4397975c20cd230261b5c55f3e945abf5bd76cdf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA476 10476 bytes

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