Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bd8396e7d749a6…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 07:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de121168fd50491d2aec3ec76c91c466 SHA-1: db20bbdf1bfe524aafc7ef40fb84f22d6c5247ec SHA-256: 25bd8396e7d749a6d880b3385902e787de79a57094d8f50136b16f21ebc9a0e3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=bsa+swimming+merit+badge+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites. The presence of numerous other external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. No scripts were extracted, and the document body is heavily obfuscated, but the malicious link is clear evidence 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.com/pify?keyword=bsa+swimming+merit+badge+pdf
    • http://files.ledgehillbrewing.com/uploads/1/3/1/4/131407944/e8258e5a.pdf
    • http://zorujor.oscarxavierdelsebastien.com/uploads/1/3/0/8/130814328/448651.pdf
    • http://files.ktandjtaxservice.com/uploads/1/3/1/1/131164231/popotunoda_rivupo_xapixok_polisalibira.pdf
    • http://files.melindapriebe.com/uploads/1/3/0/8/130873856/fasulaz_nekuxasuwovime.pdf
    • https://cdn.shopify.com/s/files/1/0437/6569/4613/files/73895180032.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/attack_on_titan_season_3_english_dub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/24333627809.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/civil_engineering_calculator_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/bubudoram.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/454783027.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/fuzof.pdf
    • https://cdn.shopify.com/s/files/1/0435/0846/5828/files/california_dreaming_flute_solo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7333/0593/files/83464863328.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3173/files/wubekexonunujegepubifared.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_off000062fe.bin
9b586013019a3920707cddd1b2f74e620636d4d8e06c18905f45f5288a0b6b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FE 5612 bytes
font_01_sfnt_off00007601.bin
5aa3e1198db8b250898fbb22dba489b6c060c73474bf723746a2db7dc54eca50
pdf-font-stream PDF embedded font (sfnt) at offset 0x7601 10624 bytes