Malicious PDF — malware analysis report

Static analysis result for SHA-256 2329c1a9f1ff1523…

MALICIOUS

PDF

41.9 KB Created: 2020-10-25 18:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcef1c4c5c449de06f01cce46f318cf3 SHA-1: 5dac44d114a2599c9b12c371fc78796ea717b9fa SHA-256: 2329c1a9f1ff1523077fcbb799e774c3bfd140fa16a7087997917237f4baddb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to attract traffic. This suggests a phishing or malicious redirection scheme.

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/123?keyword=demon+hunter+havoc+guide+bfa
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f8f62a094774.pdf
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f89b153ab1ba.pdf
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f89fed623536.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8eb869d75b1.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5f9502703d7ff.pdf
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/f65e40468ac.pdf
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/4616595.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/6612789.pdf
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/5f774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tamobalasu/bumidemakufigope.pdf
    • https://s3.amazonaws.com/jarawaxanivu/94456932102.pdf
    • https://s3.amazonaws.com/fasanag/buzanikejijevedal.pdf
    • https://s3.amazonaws.com/sugaguxagu/kemudovitilarikegakesimu.pdf
    • https://s3.amazonaws.com/jusuberu/embriologia_del_aparato_reproductor_masculino.pdf
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/4501665186.pdf
    • https://cdn.shopify.com/s/files/1/0496/6763/7411/files/6948158207.pdf
    • https://cdn.shopify.com/s/files/1/0498/0054/4418/files/15117978565.pdf
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/vefezeberaremap.pdf
    • https://cdn.shopify.com/s/files/1/0498/2449/7863/files/potudawinegarafipujoximal.pdf
    • https://cdn.shopify.com/s/files/1/0432/4006/3143/files/automatic_chicken_feeder_tractor_supply.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/formal_qualities_of_art_ib.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/von_thunen_model_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/redistributing_routing_protocols.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_off00006489.bin
d3a83c8827e24460da2d148146fa96b3a422f65c1c97eea840abf862448fd75d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6489 5424 bytes
font_01_sfnt_off000076da.bin
9607f2b8b9ff5aa1685d2d069c442f7a38b15bca56e3415eeb164152ea97bd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DA 10344 bytes

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