Malicious PDF — malware analysis report

Static analysis result for SHA-256 767684b6fbbaf4aa…

MALICIOUS

PDF

36.6 KB Created: 2020-08-19 04:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a91cb4d774d81503b5dd7ae6dbe5f07 SHA-1: 944d113bdac459e6380d323a12f240a46f67e839 SHA-256: 767684b6fbbaf4aa6eaa4c95c7cbc2f3d2e762e707e07b82e727980dffb300d6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains text and embedded links that mimic a tax challan form, a common lure for phishing attacks. The primary link, 'https://ttraff.ru/pify?keyword=tds+tcs+tax+challan+form+281', is identified as a malicious redirector, indicating the document's intent to lead the user to harmful content. The presence of a large number of external PDF links further suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=tds+tcs+tax+challan+form+281
    • http://files.kristinasimenski.co.uk/uploads/1/3/1/4/131438784/59595e4c38.pdf
    • http://files.peacelutheranconnersville.org/uploads/1/3/1/4/131453535/2c3510cf3.pdf
    • http://xakabek.thetrick.fr/uploads/1/3/0/8/130874493/suwumuduve.pdf
    • http://files.oregon-photos.com/uploads/1/3/2/7/132712558/e6da10d663b466.pdf
    • http://ruwimox.precisionskitune.com/uploads/1/3/1/4/131437402/8051219.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5912/5160/files/35716961998.pdf
    • https://cdn.shopify.com/s/files/1/0433/8591/3500/files/sandesh_news_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/8663440734.pdf
    • https://cdn.shopify.com/s/files/1/0434/3942/3655/files/23667178170.pdf
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/rotuzokelubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/ejercicios_de_pasar_de_grados_centigrados_a_kelvin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/compelling_evidence_steve_martini.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2998/files/commercial_real_estate_spreadsheet_templates.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/alzheimer_canino.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/puxagemakajutolarog.pdf
    • https://cdn.shopify.com/s/files/1/0436/2482/4995/files/66548150386.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_off000050f1.bin
9df0e6383818bb7a9483fd58797f3be5cac572732cf7d70ec1df5a1ce500ac4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F1 5656 bytes
font_01_sfnt_off00006400.bin
d4a372ef601acc4f42c20fb98563a79c4ca6e16014ee60b340eb49e36c53a714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6400 9876 bytes

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