Malicious PDF — malware analysis report

Static analysis result for SHA-256 073d273aa02365b3…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 12:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a23566210f0d9873ea5292721b224e5 SHA-1: 0ea4551170f30b84ddfe23acd8d5c00a26dce052 SHA-256: 073d273aa02365b35d9026aaa1e1a9feb6c561e213a246a2cc419521e9975ffa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=swbs+plot+chart'. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the same URLs, reinforcing the 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.ru/wix?keyword=swbs+plot+chart
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/al_arabiyyah_bayna_yadayk_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/xozabetowuzenov.pdf
    • https://cdn.shopify.com/s/files/1/0464/6918/5686/files/bitmap_set_image_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/76031685470.pdf
    • https://static.usrfiles.com/ugd/2d1648_d0f1a51096af4c24afbeafd2d355131a.pdf
    • https://static.usrfiles.com/ugd/b8c837_766d50c1f1614583b851d51ddf05118f.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/adverbs_worksheet_for_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1114/files/bsc_2nd_year_physics_practical_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/640161205.pdf
    • https://cdn.shopify.com/s/files/1/0432/3098/6400/files/les_causes_de_cirrhose_du_foie.pdf
    • https://cdn.shopify.com/s/files/1/0447/7875/0101/files/personality_test_colors.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/griffiths_electrodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0463/0786/8834/files/38785905036.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_off00005beb.bin
cfba6d0e974e7234bcb5d0bc2e9ebad2aea821ef3947505263a26d568734b6ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEB 5356 bytes
font_01_sfnt_off00006e25.bin
248d376f138d1ba00fe4db75d9f51b6475f3fbbc7413584350c5dd6c1bf54fbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E25 10224 bytes