Malicious PDF — malware analysis report

Static analysis result for SHA-256 42414c3cd31e97f6…

MALICIOUS

PDF

45.9 KB Created: 2020-08-14 21:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5e5b7c7a7ed9f816f295b2970949585 SHA-1: bd91ccd5777a2f873aaae622a3139dddd42957b9 SHA-256: 42414c3cd31e97f6318afd865c61300a440520f3b0a0bb21849a2de0f286fed2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Dawn of titans mod apk new version' and the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click a link that ultimately leads to malicious content.

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=dawn+of+titans+mod+apk+new+version
    • http://vujimidez.lamodastylist.com/uploads/1/3/1/4/131483416/2ed35045b.pdf
    • http://vubatan.jbjimerson.com/uploads/1/3/1/8/131856772/8b41f35f6a9b3.pdf
    • http://files.guldbrikken.dk/uploads/1/3/1/4/131437225/pesumo_jiwonedo_nezukudomal.pdf
    • http://files.fritzpolzer.com/uploads/1/3/1/4/131409574/zejuxedifobirivu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7622/3129/files/58799961193.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/85745396736.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/12083557212.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/96083941987.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1285/files/73833205159.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/96685476752.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/tabawet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/business_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/main_causes_of_poverty.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/63158042058.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_off0000753a.bin
81ebec015d8da87b1d116a986e4619c209401f9bb9f68f1612e4d069a4bf1537
pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 5372 bytes
font_01_sfnt_off0000878a.bin
8fa14c342c8ac5edc87a5547b418ef55187b219a660550ad37c553dbc1aa007e
pdf-font-stream PDF embedded font (sfnt) at offset 0x878A 10128 bytes