Malicious PDF — malware analysis report

Static analysis result for SHA-256 b088d35a703c6505…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 19:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5496735257b1109e4e33a4ed554f419 SHA-1: ea4bf25bc0dc2f868665bfb8d410f5553e816832 SHA-256: b088d35a703c650513f78c5858e7e0374422b3e5032d412d91cc9fb85ad579a7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Urine biochemical test pdf' and references the wkhtmltopdf tool, suggesting a lure to disguise malicious links as legitimate documents. The presence of a link farm heuristic further supports the attack pattern of attempting to drive traffic to potentially harmful sites.

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=urine+biochemical+test+pdf
    • http://wibojud.ww.juliewhitbyyoga.com/uploads/1/3/1/0/131071164/b67b7d.pdf
    • http://files.furnitureinthemaking.com/uploads/1/3/1/3/131378968/e8b61b036aac77e.pdf
    • http://files.morrowartscenter.com/uploads/1/3/0/7/130775727/a286c7.pdf
    • http://files.100womenchicago.com/uploads/1/3/0/9/130970009/6d8089b.pdf
    • http://files.raleighgroomingacademy.com/uploads/1/3/0/8/130814169/fizuta.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/5069346172.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/16774197688.pdf
    • https://cdn.shopify.com/s/files/1/0440/2744/5398/files/game._co._za_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/chemistry_in_everyday_life_notes_for_neet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/74673850624.pdf
    • https://cdn.shopify.com/s/files/1/0432/5389/1232/files/applied_combinatorics_alan_tucker_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3443/files/mods_forestier_farming_simulator_2013.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/40130841530.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/ceros_dan_batozar_tere_liye.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9382/files/famitovopunuzofevajaxone.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0081/files/lubetofufekavukodowiwog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/43390100827.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/faniwofudifitodum.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/
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/fa

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711a.bin
04d6340c0306ea3ffad20f4434f5a34d451e7dee273f3a47c7da950d5619072e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711A 5524 bytes
font_01_sfnt_off000083b5.bin
7e84a7249da64db34149e1e3c01eb9667cdbd08dc03509d7ca9aec205b8e9fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B5 10012 bytes

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