Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c30b1728ec966e…

MALICIOUS

PDF

60.2 KB Created: 2020-08-09 17:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47eb1e4ed12ad217503a35849ae6198d SHA-1: e7918404616afc203312c27954bfa5c435b768c8 SHA-256: 17c30b1728ec966ecb5cc200002565db08e3cefdeab6d1f944e9fa8390cd4eca
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 pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=bsc+agriculture+5th+semester+syllabus+pdf', suggesting a lure to disguise malicious activity. 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=bsc+agriculture+5th+semester+syllabus+pdf
    • http://files.aarhuscityguide.info/uploads/1/3/1/4/131437225/rirapokizogivoroje.pdf
    • http://files.alyshakarle.com/uploads/1/3/1/4/131437728/167835.pdf
    • http://files.prs.org/uploads/1/3/1/4/131483069/furivina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/kovevoralasazunixovuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/kewilerawilavog.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/biochemistry_free_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/6493/1992/files/45636379050.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/detazuvitafilirupilitewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/waiver_of_attorney_client_privilege_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/76967229772.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/javascript_zero_pad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/reziwalimivupusulukedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/rirajiramedamoxisudutuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevesuladufutaniwor.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/platinum_bullets_gungeon.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007214.bin
90d58267379c85fb591daeb14797da73774935c9a3ca05b2721a0bf6f22a9840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7214 5984 bytes
font_01_sfnt_off0000864d.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864D 2320 bytes
font_02_sfnt_off0000909d.bin
9d9fe7d0dc16347d76ade51ce399c328921008582a3a209c48338e2c05a5dd0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x909D 13984 bytes
font_03_sfnt_off0000bc41.bin
4362e686776cae9b5e877a8e5de4a1ff5ae9966626bcf1046762b8e3a01bbea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC41 16224 bytes
font_04_sfnt_off0000d1ca.bin
12224b502824936682d910b80e573970ea29d6601bcd2f1487498a867f907e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 4560 bytes

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