Malicious PDF — malware analysis report

Static analysis result for SHA-256 753c25a3c1d1750e…

MALICIOUS

PDF

43.9 KB Created: 2020-08-14 01:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2d5ce4851f6599c032e4e72d1705d4 SHA-1: 7998c3992ed6656d193d95c28436ccac8096f74a SHA-256: 753c25a3c1d1750e79db35e2832fada7a028aa1e87f1ba6fdf65b7ccefa633d8
152 Risk Score

Malware Insights

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

The PDF contains a "homebrewing beer guide" lure and embeds a large number of external links, many of which point to Shopify. One of these links, https://ttraff.cc/pify?keyword=homebrewing+beer+guide, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to distribute malicious content or engage in SEO poisoning.

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=homebrewing+beer+guide
    • http://files.huertadelvalle-espanol.org/uploads/1/3/1/4/131406592/lowuwuxurirulis_meponaporewi_golis_bixanilato.pdf
    • http://files.themaridor.com/uploads/1/3/0/7/130776183/tuzaf_xufof.pdf
    • http://files.drterriweaver.com/uploads/1/3/0/8/130813644/lixazo.pdf
    • http://gimori.creativelightimaging.com/uploads/1/3/1/4/131409474/5e529914.pdf
    • https://cdn.shopify.com/s/files/1/0449/6248/0296/files/958164339.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/sri_suktam_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/20724974719.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/cross_domain_tracking_google_tag_manager.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/94529903138.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41697505155.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/nafeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/ni_no_kuni_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/zisis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/fewexigosubotenulixuraju.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/personal_branding_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/pupivunepawo.pdf
    • https://cdn.shopify.com/s/files/1/0455/6845/8917/files/silipab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7148/files/74102213965.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_off00006f42.bin
959a35eaab30d8e1b743ff6f0862d1879929d1ba529050d46a1dbb122ede7555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 4920 bytes
font_01_sfnt_off00007ff2.bin
44ee6d8ec604c6ce67d64ba1268f17d815c4d210853b5a249c81d988ec0e2827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 10256 bytes

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