Malicious PDF — malware analysis report

Static analysis result for SHA-256 f685ac13b963d9d6…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 16:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f2c63638c69dac45b2d8618cdbb500 SHA-1: 3750a27780ed60dd30f846370e5d87a6d329fc7a SHA-256: f685ac13b963d9d607e33a965bd80e45b1b68eab256bdb34427fdc2886d6c996
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary malicious URL being a redirector. The document body, though heavily obfuscated, contains the text '2018 buick lacrosse owners manual pdf' and the malicious URL, suggesting a lure to trick users into downloading further content. The ML classifier 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.cc/pify?keyword=2018+buick+lacrosse+owners+manual+pdf
    • http://files.mrsfaoro.com/uploads/1/3/1/4/131452827/tezodur.pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.dansmoncerveau.com/uploads/1/3/0/7/130739786/78378f4838f.pdf
    • http://foninoz.qualitycraftedstoragesheds.com/uploads/1/3/1/3/131380606/5344732.pdf
    • http://files.shsbusinessclass.com/uploads/1/3/1/4/131483097/gezupudavopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wekisod.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/igcse_biology_experiments.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/tubirixo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/hindustan_aeronautics_limited_annual_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/surijetubenalaxixal.pdf
    • https://cdn.shopify.com/s/files/1/0434/3411/5233/files/biwuxum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/65008492060.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/kifubupezotifukisoberulod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5607/8758/files/45727516760.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/zerinitikepujit.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_off00005908.bin
82c024876640ae4ca29e6b488680b6335d2d788445e831bc4ca6d24407ba2848
pdf-font-stream PDF embedded font (sfnt) at offset 0x5908 6020 bytes
font_01_sfnt_off00006d6e.bin
d28ca405f2496ceab50d4e11693ac191b05231e238bcd4cbdfad77aa6b112cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6E 10012 bytes