Malicious PDF — malware analysis report

Static analysis result for SHA-256 2092f12318f35ff5…

MALICIOUS

PDF

48.1 KB Created: 2020-08-09 09:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2975950030582a322f8a382b0feee7b SHA-1: 79a6b58a945c52f4d4a1e0465d49e85ff08b933e SHA-256: 2092f12318f35ff59b98836f0d5bd167dcc897615699b227f8712b4fb8b73340
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a document about welding machines. This suggests a phishing or scam attempt. The PDF also hosts a large number of external links, many pointing to other PDFs, indicating a link farm designed to manipulate search engine results or distribute further malicious content. 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.ru/pify?keyword=welding+machine+types+pdf
    • http://vuvijefuj.redarrowcounseling.com/uploads/1/3/0/9/130969723/5007934.pdf
    • http://files.bournvillebowlsclub.com/uploads/1/3/0/8/130874647/2218431.pdf
    • http://kanamis.fullthrottlehancockquarterhorses.com/uploads/1/3/2/8/132815028/xugawawokezu.pdf
    • http://files.organizedphotos.com/uploads/1/3/1/3/131381021/2542065.pdf
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/77949774183.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3342/files/xoxokulur.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/bozozizexezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/84261908229.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/81030627987.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/luzutinamoniroxapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/nafizikopirimo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/45143645940.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/call_center_assessment_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/52493701726.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1382/files/surface_area_and_volume_formulas_for_all_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/pokan.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_off00007e7c.bin
e600f155527d26bb09858f96828be09e31a9a699b2083b1d9e956e3bb8e621c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7C 5588 bytes
font_01_sfnt_off00009170.bin
b9f09d71ffa953ccd207377f0311daca39c285a6d4a47ee1cde060fde9411d84
pdf-font-stream PDF embedded font (sfnt) at offset 0x9170 10076 bytes