Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dd57cc903d9b67…

MALICIOUS

PDF

48.0 KB Created: 2020-08-11 06:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ece4fb88b26ba67286b531fbf2c950 SHA-1: 8e76cfc316ff064c89f43cef2f1024e46fc2a1d3 SHA-256: e7dd57cc903d9b673c69842cc3165863b01a14dace660839b754b4ea38ab38cf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be social engineering through deceptive links.

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=list+of+collective+nouns+for+grade+5+pdf
    • http://files.liguriareview.com/uploads/1/3/2/6/132681878/xepevotaper.pdf
    • http://files.mountainstreamchurch.com/uploads/1/3/1/0/131070212/6199058.pdf
    • http://kozun.morganmediacreations.com/uploads/1/3/2/3/132302780/sofesajusezud-negufokezesegan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/breviario_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/36128301874.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/upsc_mains_blank_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6291/1391/files/20129065378.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7424/files/the_chainsmokers_closer_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/jijejaguzevuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/tatosinikazezena.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/govukafot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/wixebo.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_off000074d0.bin
bf0ba8761d65aaa07f1f8679fc061a5933bc77e83723fa4e51c98a77d0845b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 5448 bytes
font_01_sfnt_off0000876c.bin
d8b2c51020b8d28b4d8a8214d7fe5fdfb0ad7223d391ebd6b048bba01ffdde49
pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 13208 bytes