Malicious PDF — malware analysis report

Static analysis result for SHA-256 839d5751a6c27255…

MALICIOUS

PDF

48.9 KB Created: 2020-08-09 00:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b903838f79d5c908c484998b395c82 SHA-1: 4c2741407f878daf8f392d12e6e45e513917d3b9 SHA-256: 839d5751a6c27255da1d22009c000ed61f1329b7cbe7a3e6c26cee3eb56af818
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 PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, indicating a potential phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

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=clasificacion+del+cancer+pulmonar+pdf
    • http://files.shodokan.org/uploads/1/3/0/9/130969545/3516035.pdf
    • http://files.bossbabemarketing.net/uploads/1/3/1/4/131437669/0e854f8de0a29.pdf
    • http://files.kingdomtransformationchurch.org/uploads/1/3/1/4/131452841/rekojamow.pdf
    • http://files.hillcountryyoungmarines.com/uploads/1/3/2/7/132741241/regafexekevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/sisoliwo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/macbeth_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2696/files/dungeons_and_dragons_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/overwatch_item_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/tejefavoboxofudazixiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/konid.pdf
    • https://cdn.shopify.com/s/files/1/0436/8341/4169/files/59843888241.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/92770330206.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/mowawogixituxar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/how_to_uninstall_ios_10_beta.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/rutufigapazixirapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/65454807997.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/6132335953.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007201.bin
a968671de648232734a1fc93e30ebc2c37847048b2b8be11a3b0dba636c60e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7201 5124 bytes
font_01_sfnt_off00008346.bin
3473f9eb7e829d660097de0cf7a2beaa530cc11669c6910646b5fdcb8e2f7c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8346 10756 bytes
font_02_sfnt_off0000a657.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA657 4324 bytes

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