Malicious PDF — malware analysis report

Static analysis result for SHA-256 754216bbf56d2a61…

MALICIOUS

PDF

70.3 KB Created: 2020-08-09 01:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12cd2b0307f79e6ef9cde50f98349bd5 SHA-1: dc3afdbb6137ddf09065319d057075cacac3bd1f SHA-256: 754216bbf56d2a61a4b447648172a5fba0a54b238f078158f340b495abcfb3ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links suggest an attempt to drive traffic to malicious sites, potentially for SEO spam or phishing purposes. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

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=ayatoul+koursiyou+313+fois+pdf
    • http://files.cyclekingston.ca/uploads/1/3/1/0/131070845/ruzujurobu_wovibifoz_sokatobonufoj_zazofix.pdf
    • http://files.tukatavientiane.org/uploads/1/3/2/7/132712558/4304847.pdf
    • http://files.exhemplarylife.com/uploads/1/3/1/6/131607522/912cc.pdf
    • http://files.innerdolphinawakening.com/uploads/1/3/1/6/131606035/kumuvefajolen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2768/5798/files/67332051390.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/33637078532.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/jomamak.pdf
    • https://cdn.shopify.com/s/files/1/0440/2118/6718/files/mathematical_physics_by_b._d_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/zuxeraxaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/94451986376.pdf
    • https://cdn.shopify.com/s/files/1/0440/8911/4789/files/arduino_starter_kit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/strength_training_anatomy_workout_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/52666197050.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/surevibujaxolofabuwik.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/25390864210.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000d5a7.bin
dcac1369df5dfa6a390267c2ed1eb93f34a92d25e2cff40d7cc3e9685d9e0a77		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD5A7 29244 bytes
font_00_sfnt_off00009291.bin
05c261a5c6543e352a9358cf5ca4863a02bdb341a5205714b35fec57d62a5ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9291 5404 bytes
font_01_sfnt_off0000a516.bin
cf6abbe387c24a3157582b9e0afaaaf642a2b530baaa3899516d33005fa9bda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA516 16340 bytes

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