Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1539b4cba4cb1f0…

MALICIOUS

PDF

41.0 KB Created: 2020-08-13 21:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a10c775eb9a55c5faf9a334e337c10 SHA-1: f67549bcd3152fe53d70bfc345f80c6ab327adef SHA-256: a1539b4cba4cb1f03b061ebbe58abbab55944092a929d4acb3ef1e9b396ef853
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a game download. The document body and heuristics indicate a lure to a malicious URL. The presence of numerous PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning to attract victims. 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.com/pify?keyword=game+age+of+empire+di+android
    • http://wutojoj.misssantafe.org/uploads/1/3/0/8/130814328/26d67d.pdf
    • http://files.specialcareconsultants.com/uploads/1/3/0/8/130874490/2403207.pdf
    • http://files.uhstravelclub.com/uploads/1/3/1/6/131606111/4391126.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/ford_tractor_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/misalekim.pdf
    • https://cdn.shopify.com/s/files/1/0430/8326/8263/files/waxofivofovaladanurogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/18008723747.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/26390435033.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/33960416112.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/38132895403.pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/carrion_crown_map_folio.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9200/8357/files/78701217754.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/roller_coaster_decap_deer.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_off0000610c.bin
d95db14e32ca42b299ae19d6f7a40ce892e6d555bcc55084a6d47e1fa751bb6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x610C 5180 bytes
font_01_sfnt_off000072a0.bin
b5cb5d7170c14445cd49d52691f1f25f03d9e8fa49898d696f25276fb4755d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 10836 bytes