Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f20d5b4c1df44…

MALICIOUS

PDF

36.2 KB Created: 2020-08-30 04:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8bef52c0a17c21dc7375ab841081b44 SHA-1: 26f2d5d9022e8b9c3585d0d1cb4b81f811a2f532 SHA-256: bf9f20d5b4c1df4445b84e770306e1616e81c080ba89603c860871f73b209cd9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the embedded malicious links.

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/wix?keyword=the+day+after+tomorrow+movie+free+do
    • https://cdn.shopify.com/s/files/1/0429/5147/5366/files/53563739341.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/31415691245.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/1753754656.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/38057223638.pdf
    • https://static.usrfiles.com/ugd/e4ff69_88d93a2cbb8e4452bc789e18419d5807.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/wupigobapugevelive.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/jspdf_image_base64.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/brother_v3_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/dbm_vs_bigwigs.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/cambiar_de_a_word_trackid_sp_006.pdf
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/jixulurofuris.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevuwuvufotolotatagonisex.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_off00004ec6.bin
51da63984bb4889e796774f0121bc37d0fa474fb135d2c1f0538ea127906abec
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC6 5140 bytes
font_01_sfnt_off00006042.bin
30ca094ffdeb89bfd165ffda6362805c0ee26fab6414082ce2cb0b6430a06ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 10488 bytes