Malicious PDF — malware analysis report

Static analysis result for SHA-256 428dcf2c41f83119…

MALICIOUS

PDF

43.3 KB Created: 2020-08-08 14:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd784a364f6e60e1be61c18462515859 SHA-1: 2e6ea03680b6e498d6e7373821771a5b991896db SHA-256: 428dcf2c41f8311987b8e82b113fb9151ac64dd172ce72a02d2c83194890ee59
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector to 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting a 'fitness workout guide' lure. The presence of a link farm and a critical heuristic firing for malicious redirectors strongly indicates a phishing or redirection attack. No scripts were extracted from this sample.

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=fitness+workout+guide+pdf
    • http://files.giveushopemission.org/uploads/1/3/2/6/132681611/xesiwibagifili_migemevoguraba_malidoleru.pdf
    • http://files.honzahubac.com/uploads/1/3/1/4/131407977/joripane-kozazisoruzeg-majupowuki.pdf
    • http://files.jubileeaussies.net/uploads/1/3/2/6/132681144/f5a61bf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/21854306253.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/19618458434.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5767/files/16507618755.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/sd_media_launcher.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/94760845860.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7818/files/miwojowataw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/26498282158.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/posavufefozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3902/files/sasipamawip.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/rimemusilazirakow.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/geluxibiko.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9671/files/jizirotodukoselevigo.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_off00006b1f.bin
8afc23e7d0377510942e626538767ae0cc06b0a42c1229506454fd5b9b1ce6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1F 5080 bytes
font_01_sfnt_off00007c96.bin
dedf084c395a8285485a4dfa64bb34dbd182cd253915695718909277a82e716d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C96 10512 bytes