Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8741743c5b162f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 02:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394c8bdfc0af231341b89f0b38cb5f15 SHA-1: fbab46e06aed6d4888175256bbfe51293201843d SHA-256: ff8741743c5b162fa74d98ed75c6bec56cf67b6b66b987751666ff86b507c4fd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to the malicious redirector via the embedded link.

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.com/wix?keyword=10+ejercicios+de+masa+molecular+resueltos
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/51551788265.pdf
    • https://cdn.shopify.com/s/files/1/0441/0369/6536/files/31025866171.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/mumofor.pdf
    • https://static.usrfiles.com/ugd/b8c837_394a5068d7e449e1b1c9c88527e82da4.pdf
    • https://static.usrfiles.com/ugd/77d535_8b68d787671c48a6b2babcd70089c0a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c11c106f5308404e8bcecb6ab144af0b.pdf
    • https://static.usrfiles.com/ugd/a44510_f6c0e0f69f7e4d12825e02be3329287a.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
    • https://cdn.shopify.com/s/files/1/0461/8233/4617/files/messages_for_web_android_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/resort_hotel_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/gabizaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/guxadekoreviwed.pdf
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/jatapagiwelomonibajarubop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/air_cooled_heat_exchangers.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_off0000609e.bin
613c2e533ddaeecddd49940d2da94b23b86b6007481dc75b5add5361c8a32e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 5260 bytes
font_01_sfnt_off0000725e.bin
d1b7238014292d55d35e3487784325658f49b2690c7429a750cb67401eece2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x725E 11140 bytes