Malicious PDF — malware analysis report

Static analysis result for SHA-256 3849fefba42e0022…

MALICIOUS

PDF

45.3 KB Created: 2020-09-01 04:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8e516e3b0ea9a66c09c7673568375bd SHA-1: 746db8468b37bb222ce3ca6997d868e9a7533fc2 SHA-256: 3849fefba42e00222b871013e522384ba12c52d84e3d50839890bdc2462083be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.club, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL. The PDF also contains a large number of links to external PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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.club/wix?keyword=custom+wordpress+template
    • https://static.usrfiles.com/ugd/353d00_e1546a6bf86f4d918ba2385c99be9e78.pdf
    • https://static.usrfiles.com/ugd/b8c837_362636c542d14cf99d234a49f50086fc.pdf
    • https://static.usrfiles.com/ugd/7603ae_c39b4659313f4c46b635bc872c470ef1.pdf
    • https://static.usrfiles.com/ugd/b7ed05_96f4283758444b608f71342f4b023d5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3762373ea8146398da9c2599adf7e9a.pdf
    • https://static.usrfiles.com/ugd/93c935_84d372cc9b444046a1984d4d058e1048.pdf
    • https://static.usrfiles.com/ugd/b50c55_c92f1a2f60c440e58b363a4fdc696f33.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_593064ab255645b5b8d114c5edbb5167.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/filararerovexenujavilalo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/55289622685.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/6766791456.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/98848743937.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/banjo_movie_free_hd.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/67353427870.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/2923335228.pdf
    • https://cdn.shopify.com/s/files/1/0436/0830/9923/files/26508333436.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_off000065cc.bin
5a9a577b51ee8b3a9f4c9b396836223ae781f82347699c5c9e503f6ab93b3609
pdf-font-stream PDF embedded font (sfnt) at offset 0x65CC 5100 bytes
font_01_sfnt_off00007713.bin
40a652df8118ff9b9d6e0230ac6239fc34dfb23e379764db904dda575f9a3d29
pdf-font-stream PDF embedded font (sfnt) at offset 0x7713 15912 bytes