Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c5064510382c42…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 10:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 211752d14e7b893f9a708356f1262767 SHA-1: 5cb7d527aca09312cd2411a2b93624e717df113a SHA-256: 91c5064510382c42fb976756128f733d420691cbbb8d0ffea20c54af8359f4dc
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a malicious redirector (ttraff.cc) and for containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body contains the URL that triggered the malicious redirector heuristic, suggesting the PDF's primary purpose is to lure users to malicious sites.

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.cc/pify?keyword=d+d+basic+set+pdf
    • http://files.fivelakescabinetry.com/uploads/1/3/2/3/132303013/zedanoxugewetoje.pdf
    • http://files.buyboxblog.com/uploads/1/3/1/8/131858916/rojosivimuduseti.pdf
    • http://files.khhsbands.com.au/uploads/1/3/2/7/132740606/juxixatad_rabifaraxome_fokabajeteneze.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/81171269775.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/python_true_false.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/80019801346.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/rusol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/27833326239.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/58685054109.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/marozub.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/arabic_language_course_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/risirutemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/24353968749.pdf
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/53705148770.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/zifileketobomudan.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_off00007b6b.bin
a1d4a230a6b3c75469888fb67d865e6da88d47c1df74117687908a57fea7f20d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6B 5160 bytes
font_01_sfnt_off00008d0d.bin
3dae943452eba660479047fe70c31b6ecf2df463cd2d20c955b51eb43d562ac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 10580 bytes