Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6de7d26cef2a8b…

MALICIOUS

PDF

49.4 KB Created: 2020-08-29 09:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d442dd3df75c8c41230abce9002527c8 SHA-1: 714f97aafa2dda5c5f28226a37035c56e5502cf7 SHA-256: 7f6de7d26cef2a8b5ce3619e5082ae8864323767d5d01e664f23087c4983c940
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=how+do+you+say+hi+in+somali'. Another heuristic detected a PDF link farm with many external links, predominantly hosted on static.usrfiles.com and cdn.shopify.com. The document body contains garbled text but includes the same suspicious URL, suggesting a lure to a malicious site.

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=how+do+you+say+hi+in+somali
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1036/files/sholawat_munjiyat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/zojujedekofelawoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/47574778702.pdf
    • https://static.usrfiles.com/ugd/b8c837_c97a82544fe94d92bc39cdba9a0d821c.pdf
    • https://static.usrfiles.com/ugd/b8c837_094af72cd90b4be5bbd195cef94fabbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_39f0f66d1d6e4fa6876cafb002f957c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1977e24afb7649d0acc0ee49f92a2f31.pdf
    • https://static.usrfiles.com/ugd/b8c837_aadcf8a96d084ebfa32b9fbf7c27fc9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9f0b932ee554fec96eb601382c7aa5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6107fba7ee425ba769464669ef6d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_b089d3b1d70b428681402cc08f38a9eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_11933d5931124f92991a5995b3c0b8c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e001332d39b4cd69e54935833f64099.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e62.bin
16507e76f15147bf944910eadd9c89b45d78a80c7df3143f935328d58b417c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E62 5124 bytes
font_01_sfnt_off00007fb5.bin
25b88160251110d02002e65edd1ab5c3c25638cce7429f6e5d7ca848e7b0c1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB5 10380 bytes
font_02_sfnt_off0000a36a.bin
a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA36A 16084 bytes

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