Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb305f6e4de97ba6…

MALICIOUS

PDF

36.8 KB Created: 2020-08-23 20:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2414d58e8c4667292058cff13f7c9541 SHA-1: 892f8a7cf3bd868fa8e42566578535806e632ac6 SHA-256: fb305f6e4de97ba641d2d12cd056b66ac222ed5542b68771205e9ee70824d260
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a Facebook Messenger update, aiming to lure users to a potentially harmful site. The document also features a large number of embedded links, many hosted on Shopify, suggesting a link farm for SEO manipulation or distributing further payloads. The ML classifier strongly indicated maliciousness.

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=facebook+messenger+free++low+version
    • http://xusiban.hesslerspoodles.com/uploads/1/3/0/9/130969060/5216342.pdf
    • http://files.ceedproject.org/uploads/1/3/1/0/131069886/wazab-muvujibuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/hewwo_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/wabozozefukazewu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/xalusejagawaneto.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/97392350195.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/juxakiwojebufigugiwizose.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/39822915045.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/5833445393.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0438/4866/3200/files/takereserenimalezesewuga.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/gogezutuvanuzadonijav.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_off00005192.bin
29bf55a6d0824e089921d838856fd712dfe1602d4e78e695047be75b432f4b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5192 5512 bytes
font_01_sfnt_off00006456.bin
a8202d33df240e929082d5c3cbc88c74697142a299bbcd7a90822ab3aa150b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6456 9956 bytes

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