Malicious PDF — malware analysis report

Static analysis result for SHA-256 83539197d172e25c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-03 08:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f83daed02d1bfc74f43c7db59d4c0b SHA-1: 282961fe8eca8e65576891fd2b16ec9f2ba58379 SHA-256: 83539197d172e25cb7cdc99c746cf4a856a849e5a697d678aadfe45d5f510ad3
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector service, indicating a link farm or phishing lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=htc+unlock+boot+loader, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to unlocking bootloaders, suggesting a lure for technical information or a scam. The ML classifier strongly supports the malicious nature of this PDF.

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=htc+unlock+boot+loader
    • http://files.patradolk.com/uploads/1/3/1/3/131384638/399804.pdf
    • http://files.snugwicks.com/uploads/1/3/1/6/131606397/loraxejubiboni.pdf
    • http://files.wcorbin.net/uploads/1/3/0/7/130775223/vodaverejavetu-tibuboxo-zamonalu-pamoxexezaberon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/xiguse.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/minecraft_tinkers_construct_ecological.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/cheerson_cx-_10c_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/23571228989.pdf
    • https://cdn.shopify.com/s/files/1/0429/2529/3724/files/black_demon_slayer_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/kafibasepajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/17586963678.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/51832649514.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/zudumesefilup.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/gazuvozosumumusaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/86027980712.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_off000066f2.bin
579ee0829a284ed5ee306c247e76d9974358c9ce9154b8ba500b7b57139dee03
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F2 4920 bytes
font_01_sfnt_off000077b6.bin
bbbe0ef7dd9ea8b7991572591dc6b24d260a80fcb4b37f881eb9a54c7fd83d94
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B6 10252 bytes