Malicious PDF — malware analysis report

Static analysis result for SHA-256 071a5bf631f4aca9…

MALICIOUS

PDF

38.9 KB Created: 2020-08-20 20:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41469a345a8441bdee449ecf2116a469 SHA-1: 271142d6bbd94a9ba6ff83d540ca477a75adb924 SHA-256: 071a5bf631f4aca9fb8b32ccf7c7106c6c9b74d50343001de1b795d8c1681dc1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links, including one pointing to a known malicious redirector at https://ttraff.ru/pify. The document body, though heavily obfuscated, appears to contain the same lure text as the malicious URL, suggesting a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=high+school+english+grammar+book+pdf
    • http://files.fullcrescentpress.com/uploads/1/3/0/7/130739513/sewomatowuvuk_zoseritalu_pexafokak.pdf
    • http://files.poehaku.com/uploads/1/3/1/6/131607239/ab7f23f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/556195212.pdf
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/lomora.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/convert_word_to_excel_small.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/loxujoduli.pdf
    • https://cdn.shopify.com/s/files/1/0448/2777/1040/files/medical_physical_fitness_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/bridge_to_terabithia_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/8663/3377/files/errata_sheet_cplr.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/99099533087.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0445/3344/8868/files/aims_and_objectives_of_dissolution_of_partnership_firm.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_off00005920.bin
f44a293e3f0193212ffa43349263674b2970b6250bdf20748807f316aa276166
pdf-font-stream PDF embedded font (sfnt) at offset 0x5920 5732 bytes
font_01_sfnt_off00006c66.bin
207eb93d9f8bb98690325953e43f6ed204ace071c171c7d0876f4ee0eb65a3b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 10060 bytes