Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a2361d626fe44d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-25 04:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fde9942788f06fca5160d036a560f765 SHA-1: d0a3404172e07bd75137941573fd945e3959f58b SHA-256: e9a2361d626fe44d1a1a1b008f7c3e59c98bc6d005ab62dd2963130cafa9420c
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/pify?keyword=automatic+transmission+repair+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'automatic transmission repair pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=automatic+transmission+repair+pdf
    • http://files.monarch-creations.com/uploads/1/3/1/1/131164399/vegibilugukisitin.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/togekujumojalir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/gosaxevizitoku.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/worafowinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/dijuzunipomuwipazopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/star_wars_battle_front_2_ps2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/90027509815.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2460/files/buku_teks_bahasa_arab_tahun_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2965/files/60538515991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2407/files/step_down_transformer_winding_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/79621594868.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_off0000658b.bin
98abf3a6d572c32d65b9b9810f6517b779b03d49792a64119f6736f05c6db1b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 5260 bytes
font_01_sfnt_off0000774e.bin
6c3b13aff305d6a8761bd0ac55d2d49c99d194a341c04e98da71c9a99f56f062
pdf-font-stream PDF embedded font (sfnt) at offset 0x774E 9852 bytes