Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f297398e4dba84…

MALICIOUS

PDF

33.5 KB Created: 2020-08-22 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc9753c8dedb37afbbff0ecbe215e2e SHA-1: 714664a54c0def4c409173a5547efb4055a32e63 SHA-256: 33f297398e4dba84a8b9941b187134b7004d7c758e744e239299eec261af3d83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'free avery 5160 christmas template' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=free+avery+5160+christmas+template
    • http://files.bskyfitness.com/uploads/1/3/1/3/131381450/tipej.pdf
    • http://ragozedak.ingridbrudevoll.com/uploads/1/3/2/7/132741389/wazefadu_jiwev_fivovali_mazazizevaviro.pdf
    • http://takef.gatewaybiblebaptistchurch.ca/uploads/1/3/0/9/130969192/botakakom.pdf
    • http://kedevu.kenyonproperties.com/uploads/1/3/2/3/132303195/buzulowev-zalov-liwikotatiru-jonar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/3189/1861/files/aircraft_structure_repair.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/71985899045.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/japowes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/56005372004.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/71446225935.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/53140792722.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/lijifidodozafop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/wuligivewufezefeketutitox.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/53846328008.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/aleks_math_answers_algebra_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/bissell_little_green_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43545787384.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004562.bin
daa84da416a53d4db1d746136049fce60b42b7d8fc066cbd9ff783a4ec65a731
pdf-font-stream PDF embedded font (sfnt) at offset 0x4562 5764 bytes
font_01_sfnt_off000058ed.bin
5d7e9d58abda6cf91d0e72c79315e8899fafbdd7c0335e799b32f84e4a737b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 9416 bytes