Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b11789f36cbd7e…

MALICIOUS

PDF

50.7 KB Created: 2020-08-12 11:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d638a2be02d73393180ed1ba4cda8979 SHA-1: b0f3217c680ae80c22aa4175c16d4d225d322b58 SHA-256: c0b11789f36cbd7e2d3a3baf86891453a8928f001526300264db7b7003328de5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The primary malicious URL is https://ttraff.cc/pify?keyword=simple+way+to+learn+english+speaking+pdf, which likely leads to further malicious content. The document body, though heavily obfuscated, contains references to learning English, suggesting a lure to entice users to click the malicious link. 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.cc/pify?keyword=simple+way+to+learn+english+speaking+pdf
    • http://files.tamsynvanrheenen.com/uploads/1/3/2/8/132814022/5233260.pdf
    • http://files.talsegevphotos.com/uploads/1/3/1/3/131398555/kiwuvibekuwotiwaxaja.pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.arcc06quebecmetropolitain.com/uploads/1/3/1/4/131484133/pajub.pdf
    • http://files.wistorian.com/uploads/1/3/0/7/130739758/sabid_selik_baletoralo_mozifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/57704936986.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/pokemon_ruby_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9309/0714/files/41617056230.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/49068027307.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/medela_breast_pumps_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/66135091420.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/ruxovenabeposumeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/29268569127.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/42945532687.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1376/files/fagojiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2581/files/annabac_2_physics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9878/4422/files/sudden_sensorineural_hearing_loss_treatment.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_off00008660.bin
3fe75924d60c8b31e3190f4524d2445a89fc7d09004ebd86feec01e9cad93435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 5816 bytes
font_01_sfnt_off00009a0e.bin
53d70e9744f88f33e7ad3277d4d43331586a4edd2daeb22b1cab898ee7eeca41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0E 10468 bytes

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