Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cd6b646de301af…

MALICIOUS

PDF

38.7 KB Created: 2020-08-04 08:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2306cdd2fd341f6073e2444080353196 SHA-1: ce869f7b645188d904e29f8c8ec66cdb36e32de1 SHA-256: c4cd6b646de301af0725070af32c2d57ed27833e120d1ae78c607c5322003ade
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with the primary redirector pointing to a known malicious domain. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=cakewalk+pro+audio+9+manual+pdf
    • http://files.sfrmd.com/uploads/1/3/0/8/130813301/simurubes-wimibedubapi-petin-lenubesiwopil.pdf
    • http://files.midlandsmortgages.co.uk/uploads/1/3/1/4/131452887/fuxaxuxef.pdf
    • http://files.gnshs-pto.org/uploads/1/3/1/3/131398242/9955108.pdf
    • http://files.stjosephhewlett.org/uploads/1/3/2/3/132302871/6310631.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/wewazupufozevazadijoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/55490440552.pdf
    • https://cdn.shopify.com/s/files/1/0430/6839/1577/files/my_balls_manga.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/bamuziwenulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/home_access_center_keller.pdf
    • https://cdn.shopify.com/s/files/1/0437/3574/4673/files/save_svg_as_image.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/fonarakalubu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/jigov.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/59072325123.pdf
    • https://cdn.shopify.com/s/files/1/0435/5119/5299/files/75564703877.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/zomipafowuta.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/45855815129.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_off00005b0f.bin
d32626b3eaf8c5221ce745359879d42b36fb3b3c2b913381d3d771d7bc57cea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0F 5224 bytes
font_01_sfnt_off00006cd2.bin
856fd792e81cd488348b255dcd4ddfbabd7377b09263b6a8c0254a474e746001
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD2 9688 bytes