Malicious PDF — malware analysis report

Static analysis result for SHA-256 752887205f6d9f96…

MALICIOUS

PDF

40.7 KB Created: 2020-08-10 05:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d0cade0a3be59896dbff8c9c8c0c488 SHA-1: 7fff92de3effd1d6619a6e8377b67058ce1ee1c0 SHA-256: 752887205f6d9f965814295e4128da9174e9f465a5806b3cba0a705001302b31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes text suggesting it is a 'Bosch washing machine repair manual pdf' and contains the malicious URL. This indicates an attempt to trick the user into clicking the link, likely leading to a phishing page or malware download. No scripts were extracted, but the presence of a malicious redirector and the lure text strongly suggest a malicious intent.

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=bosch+washing+machine+repair+manual+pdf
    • http://files.lfhnursery.com/uploads/1/3/1/4/131408062/3090918.pdf
    • http://files.tuxowner.com/uploads/1/3/1/4/131483492/gexiniz.pdf
    • http://files.clearwaterlakemn.org/uploads/1/3/1/4/131437680/nupowobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/history_alive_textbook_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/fariloj.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/wodusimadikinagik.pdf
    • https://cdn.shopify.com/s/files/1/0447/7625/9735/files/blockchain_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/17998977758.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/61586966296.pdf
    • https://cdn.shopify.com/s/files/1/0439/4034/8059/files/36835370168.pdf
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/calisthenics_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/vekiruruzozegovowexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1065/files/54789221499.pdf
    • https://cdn.shopify.com/s/files/1/0437/2457/0792/files/xagigepu.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_off00005f02.bin
5a772afc086b9dc5e9fae4a8d1dc191985fb8524f978c86680fd0e1fe1852b9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F02 5712 bytes
font_01_sfnt_off0000725f.bin
f2f6ed6efa4983f85970eaeb9e240c55326c3be1fcd3165d6b3f83b6d0b33d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10480 bytes