Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5e80adbbd5d5fa…

MALICIOUS

PDF

40.2 KB Created: 2020-08-19 02:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce7d767575ab2046a83dc3d48eb55d5 SHA-1: 69d822d4b63a0c403be371a9b90c7ba1e1971272 SHA-256: bc5e80adbbd5d5fa34955e755bd4f1e7028bb4ed8148f01ff89b2f9a8e5051e1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is used to deliver a lure for an 'amazing spider game apk'. The document also contains a large number of embedded links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the true destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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.cc/pify?keyword=amazing+spider+game++apk
    • http://files.importdollscarclub.com/uploads/1/3/1/4/131453060/ebf93.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/denon_soundbar_dht-_t100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2993/8855/files/lezog.pdf
    • https://cdn.shopify.com/s/files/1/0436/7882/6661/files/lawepirudifubabezara.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/kogowakogos.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/night_parade_of_100_demons_anime.pdf
    • https://cdn.shopify.com/s/files/1/0439/0646/5947/files/avery_8366_template_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/cerumen_impaction_patient_education.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8537/files/chlorhexidine_topical_davis.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/zefezegenogiwakaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/16130311682.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_off00005fa0.bin
ad685178b219c29a167fe8f679e015da21b36536f27681d2328cbd6da9232957
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA0 5348 bytes
font_01_sfnt_off000071b8.bin
1b3222ef033a7b5638721393cae6cf6b84fa845a700908398bbecedc13193d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B8 10128 bytes