Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf40a676fc9088f6…

MALICIOUS

PDF

41.1 KB Created: 2020-08-10 06:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf084b9dff0b5310a93f59b6ffec9ac SHA-1: b7569a2f6a22af1f5bc7fb10038f58468fac77db SHA-256: cf40a676fc9088f69a94f38109f0973d81a22420ad2c39a95283441418d89382
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=physics+of+amorphous+materials+pdf'. Additionally, another critical heuristic identified it as a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body contains embedded URLs, reinforcing the malicious redirector link. No scripts were extracted from this sample.

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=physics+of+amorphous+materials+pdf
    • http://files.sydneylimitedstreetrodders.com/uploads/1/3/1/6/131606762/jowifujawop-gumapatuvagasig.pdf
    • http://files.technologysolutionsgroup.biz/uploads/1/3/1/4/131454620/3205910.pdf
    • http://wovuloxev.rfsmithecology.com/uploads/1/3/1/0/131070872/0e3a9a917f.pdf
    • http://files.fabritechms.com/uploads/1/3/1/8/131856539/saregil.pdf
    • https://cdn.shopify.com/s/files/1/0433/6471/2616/files/31766038003.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/kifiremosunegizesig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/janidasajuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/berowojoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/pathfinder_roleplaying_game_advanced_race_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/cardboard_furniture_diy.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/bofoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/84777601897.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/79334205535.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/27544520593.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3079/files/97335682271.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/kudarotalatinaxutor.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/60250685792.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_off00006287.bin
a5dc69fd590f0308fa9993715e38315946a82c83276e625c0b39989dba75177e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6287 5496 bytes
font_01_sfnt_off00007518.bin
903c5e1ce71ab67c1e0b6cb4e1f06f10e162e8b4972f7eea16ea164b051c2fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7518 10008 bytes

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