Malicious PDF — malware analysis report

Static analysis result for SHA-256 c188341f43f01ff2…

MALICIOUS

PDF

51.2 KB Created: 2020-09-07 11:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5977b7943fcfebc8f9d5d11b9986d1b SHA-1: 89cdf1c1e40ec383e397ee5e248c7d755431dc7f SHA-256: c188341f43f01ff253c2d08c6f94ff722699a1c4987e2b0c6c58e92371fa4a37
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a 'cv marketing digital pdf' lure, which is then followed by the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link within the 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.me/wix?keyword=cv+marketing+digital+pdf
    • https://static.usrfiles.com/ugd/0e6328_c98d326dec674b76a10aeb3d60fd6137.pdf
    • https://static.usrfiles.com/ugd/2a1429_492448bcb16f4e26a7dcd398e0a8f4dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1051f93a97403fbf82fefb01b3a263.pdf
    • https://static.usrfiles.com/ugd/6cf804_a80d2dc9e0b74c86a3960cd4eeb56f50.pdf
    • https://static.usrfiles.com/ugd/5c7528_24bdd08315d944d6aed27debb3bbd2f1.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/77008720422.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4986/files/bamopelel.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/83653381587.pdf
    • https://cdn.shopify.com/s/files/1/0443/4313/2316/files/ancient_history_notes_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0431/9009/1940/files/barcode_ean_13_crystal_reports.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/fipuvewusiverefutuvixit.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3765/files/45353983376.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/nileram.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/2477665659.pdf
    • https://static.usrfiles.com/ugd/43d598_705c0a4622b045e783d39ef93a41f338.pdf
    • https://static.usrfiles.com/ugd/d1c05f_0510045b6edc46ed8d776c17d015ef20.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007509.bin
0443b06d9e3ad4b4fce5116ce4106dab3e244ef5b94ac91ad70995f89b26fc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 5212 bytes
font_01_sfnt_off000086b4.bin
f4f3917800168e7513a8f7a2e055f27ca7527456e209277f9030be25fccf92b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B4 10412 bytes
font_02_sfnt_off0000aa98.bin
18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA98 16144 bytes

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