Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ef1d1b7cfef7de…

MALICIOUS

PDF

57.2 KB Created: 2020-08-25 01:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f949aabfc7f0e199b565228dcd13f538 SHA-1: cb22f7d0447fb80138117a831903b5e74090b6ce SHA-256: a8ef1d1b7cfef7de348b22f48aa4acf426104f7b34c5908be405ff1a19fbaa15
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm. One of the primary links redirects to 'ttraff.com', a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the suspicious URL, suggesting a potential lure or distribution mechanism.

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=crispest+bed+sheets
    • http://jeliverew.xxxsun.org/uploads/1/3/0/7/130738629/daxivafuvejekeb.pdf
    • http://files.theprairiegems.com/uploads/1/3/1/1/131163898/7401252.pdf
    • https://cdn.shopify.com/s/files/1/0439/3841/4760/files/5312732030.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/begum_light_font.pdf
    • https://cdn.shopify.com/s/files/1/0458/6120/8217/files/jexevunawuxorudik.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/73049621364.pdf
    • https://cdn.shopify.com/s/files/1/0464/1180/8936/files/fajofedobetovogabotuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ziduvawijixivobufanevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/73889367161.pdf
    • https://cdn.shopify.com/s/files/1/0459/6354/2688/files/c_u_t_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/1st_birthday_invitation_video_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/bejibadimojilet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/takekozidebovezodix.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/29916091519.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/fl_studio_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/kutabusarafudaz.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_off0000a3c2.bin
f08ecf05723882815e46cbc200168e603fa18747b70d1da42e90aae56454b165
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C2 4848 bytes
font_01_sfnt_off0000b42c.bin
fe4a81ea3075e2ea2ba37890a4b50ccb39673b7a36da7caac9cf48b3c7a99850
pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 10420 bytes