Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38acef34156fec6…

MALICIOUS

PDF

45.0 KB Created: 2020-08-19 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f8cf33c3038a4ddaffb367fbce058b0 SHA-1: 7e75f93e45afc8a8d2ca236740e464bb8cb5043a SHA-256: a38acef34156fec638ecf8d815831694ba46fd689cb996d891b378e63deedbf9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=bad+blood+book', suggesting a lure to a malicious site disguised as a book download. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or redirection attack.

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=bad+blood+book
    • http://files.britttanya.com/uploads/1/3/1/6/131637135/7b05187c.pdf
    • http://files.shamansspirit.net/uploads/1/3/1/4/131407148/1158657.pdf
    • http://files.hinksoncompany.com/uploads/1/3/1/3/131379054/rodurekufixugubegep.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/vapuvoxogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/zenanigilabofonoliwetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/2475234380.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/caterpillar_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/usarec_manual_3_0.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/american_psycho_movie_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/regedazutegewigiwinizapux.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/pudibakavave.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/vodepalevipagikukir.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_off00006fa8.bin
784034630de39c6b173c13afb3ffe308e614cc9aa75b6c91ccb05eb42856ddde
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 4796 bytes
font_01_sfnt_off00008009.bin
368eaecc2e2eaf98d9c143ae8b46a8d574d12d220ac39b81d5a734aa5744c17d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8009 13964 bytes