Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f01d71b8d63c46e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 02:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed67eb0956dd1005765c2052afc2843 SHA-1: 0563b91736eabc374849324cf639c07319d3a2b5 SHA-256: 5f01d71b8d63c46e60b5fbcaf75b5a6d2681d37431bd58ecb3bec9e4c517ae7e
154 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of embedded links, many of which point to PDF files hosted on Shopify. This suggests a link farm or SEO manipulation tactic. Crucially, one embedded URL, 'https://ttraff.com/wix?keyword=the+witcher+3+redania%252527+s+most+wanted', is identified as a malicious redirector. The ML classifier also 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/wix?keyword=the+witcher+3+redania%252527+s+most+wanted
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5781/4421/files/6322001475.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/betty_la_fea_y_su_transformacion.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/anne_bradstreet_biography.pdf
    • https://cdn.shopify.com/s/files/1/0439/1862/2875/files/casey_s_law_petition.pdf
    • https://cdn.shopify.com/s/files/1/0460/0791/0559/files/45557407115.pdf
    • https://cdn.shopify.com/s/files/1/0432/2603/8433/files/cypress_hill_albums.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4236/files/punida.pdf
    • https://static.usrfiles.com/ugd/b8c837_704e379a2a26416eabe240f17ddfaf37.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf7468eef4784c808862f6d1e4374b4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_680cec348eef439dabd0a506550f8eb2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006746.bin
3cbab3b3888ed817ea96dd51e504cfb1546616721fb732554d4efa8b30592229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 5388 bytes
font_01_sfnt_off00007981.bin
55d6601802b72e021f65f6c309e5594071f8aae486495c6a8049af624f10271a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7981 10296 bytes

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