Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dacd896d0725d6…

MALICIOUS

PDF

44.1 KB Created: 2020-08-23 16:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3025d92d62924117a001dd6c3b801a6a SHA-1: a34fe6ec62e46ddac1d39ac4334e88d0beef63e8 SHA-256: a4dacd896d0725d63e19476878edbf304f1dc1e2740893729ffed4c1fa37d01e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=2008+holden+barina+tk+manual'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=2008+holden+barina+tk+manual
    • http://banixot.cheekychomps.com/uploads/1/3/0/7/130738799/jufupejupiwuxadawepi.pdf
    • http://razolafi.jarboproductions.com.au/uploads/1/3/1/3/131383629/c9dc865e.pdf
    • http://gutomubom.uplinkfitness.com/uploads/1/3/2/7/132710797/22b73753.pdf
    • https://cdn.shopify.com/s/files/1/0429/3296/1443/files/41769162109.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/jidigapatotalof.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/66435910538.pdf
    • https://cdn.shopify.com/s/files/1/0428/7486/3772/files/ap_budget_speech_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/pazobalowabap.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/44120923233.pdf
    • https://cdn.shopify.com/s/files/1/0434/7953/1673/files/concierto_de_aranjuez_adagio_solo_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7972/files/barusedadawevedonovezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/gasujapubazamojixosux.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/12007742863.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/87973232155.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_off00006cc3.bin
3ea2cdf1ac4146e4a3fb2d04496ca610f925bebfec0b9600437837c887595f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC3 5464 bytes
font_01_sfnt_off00007f18.bin
b5afa99c3922a851d480f5ff393864157f5d2113f80eee999c09a0825b888be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F18 10736 bytes