Malicious PDF — malware analysis report

Static analysis result for SHA-256 810fd597a8b708f1…

MALICIOUS

PDF

37.0 KB Created: 2020-08-30 23:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07bbd8e7f44edf4913e59971d5f073dd SHA-1: ca371879012a3d0104941662e4ad1ceadc84f1f4 SHA-256: 810fd597a8b708f1d3aa365d736e013a25ae7627228fa10d5d128ef539d4e7fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body itself is heavily obfuscated but contains the same redirector URL and a list of benign-looking PDF files hosted on static.usrfiles.com, suggesting a link farm designed to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=area+of+irregular+shapes+worksheet+g
    • https://static.usrfiles.com/ugd/d2751c_98215b52da8a45daaecb165d7e30ef8f.pdf
    • https://static.usrfiles.com/ugd/f1780b_6348559919364b92ab83db2b3b3601d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc3a2a58ac94b36bb8b3bdd4e5be681.pdf
    • https://static.usrfiles.com/ugd/289c5e_9642a7d956384ccb816d7d981f474630.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/kojilewifetamatu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/23723768695.pdf
    • https://cdn.shopify.com/s/files/1/0438/0311/5680/files/21088728881.pdf
    • https://cdn.shopify.com/s/files/1/0433/9036/9959/files/maharashtra_imarat_bandhkam_kamgar_kalyan_mandal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/muzegar.pdf
    • https://static.usrfiles.com/ugd/b8c837_951fbc97f0314ad6833cd4c16376dd10.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ec32486ed4b34485af417973ae2b3d1b.pdf
    • https://static.usrfiles.com/ugd/a31856_f26848a8c3794ac296bd026956b2d8d8.pdf
    • https://static.usrfiles.com/ugd/eb4c03_4fb418a85d5d41d1b2868af004a924ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_0677136015d9489eac8d7ecfd4b1d9ae.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0439/6918/3902/files/vomujojug.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/77688626872.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/sukilidijajigamijager.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_off00005356.bin
7d408bd6198cd8200a36094057c9a45592b74de8f74d6ac23d5c8f978a358532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5356 5308 bytes
font_01_sfnt_off00006571.bin
ac1bbcdcb06e3328b017984a5350a6b53728a31595c852989807b085cb9b5cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 9988 bytes

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