Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbf4d938e4c5f73…

MALICIOUS

PDF

46.3 KB Created: 2020-08-17 15:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326d9d95d7dda9d380cebe245dee854f SHA-1: 473605a25fb1fabfdcc24dc7384b168fb2c6f842 SHA-256: 8fbf4d938e4c5f7354aade221631c2035310d3c707fafe1d9f0062a3ccaf0333
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector link, suggesting a lure to a malicious site. The presence of numerous PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to obscure the ultimate destination.

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=best+brightness+app+android
    • http://files.plainfieldgirlscouts.org/uploads/1/3/0/8/130813692/julodelarukat-kadovejexabo-fefuwiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2204/8667/files/jexerikaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/dojadobapefilorajipodiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/zemiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/1524/7771/files/oxford_word_skills_intermediate_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/fapomadafelurinilures.pdf
    • https://cdn.shopify.com/s/files/1/0452/8193/5522/files/75365134416.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/puleroraxifezuvowaturuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/55519865105.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/kutabusarafudaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/72995743430.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/8101570191.pdf
    • https://cdn.shopify.com/s/files/1/0439/4926/0968/files/linux_add_text_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a5e.bin
06780fae02517d6dcecb9d78e1e542ce5747601390869a4a5e227403a45e7185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5E 5168 bytes
font_01_sfnt_off00007bd8.bin
0a5bd525db49031735c79a611d7b00c19741b8210985a8f482e42246134682cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD8 10092 bytes
font_02_sfnt_off00009e6f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6F 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.