Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5637be15af7701…

MALICIOUS

PDF

34.9 KB Created: 2020-08-21 14:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d91025b3ef36601a09a46bd4bc29d9 SHA-1: e04a045e070106abf298736e172d51fcb57d8e57 SHA-256: 7b5637be15af7701293ccd5142975e50b092bd373497d44df26d19d0082500d8
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 movie downloads and the malicious URL, suggesting a lure to trick users into visiting malicious infrastructure. 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=adventures+in+babysitting+2016+full+movie
    • http://kabujipiz.aghemu.info/uploads/1/3/0/7/130775503/didewakedaz-degirane-zarelavegar-pirufu.pdf
    • http://kekaw.lindsaydiabetesproject.com/uploads/1/3/1/4/131437736/5836089.pdf
    • http://files.rachaelsthoughts.com/uploads/1/3/0/7/130775393/ruwul-fapoj-diziwatopuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4508/5606/files/ersan_ilyasova_contract.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/read_and_follow_instructions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/jomiw.pdf
    • https://cdn.shopify.com/s/files/1/0463/0960/5541/files/soresupiwowowatitureviwod.pdf
    • https://cdn.shopify.com/s/files/1/0436/7283/0105/files/functional_groups_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/39126776768.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/vevegixibiwolij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0433/7146/2814/files/paxevagigip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/zupepotel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/66446861836.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_off00004832.bin
fef58f430ce9564028e1f45345884417883e6e4feaec07d10aa8fd036a9e96f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4832 5996 bytes
font_01_sfnt_off00005c96.bin
dbe16566707fc79c010c7a21104fab9dee00a438d80cc31c4584338f03aeeba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 9956 bytes