Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ee4d359e1716b5…

MALICIOUS

PDF

42.0 KB Created: 2020-08-02 14:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f50e2fac956464f34fc7aa10ec13dbc5 SHA-1: 3aab84b96760b8d2f6cd82418903f0f20595455b SHA-256: f2ee4d359e1716b56870daa499016c6e7c59640547190db6187de631153d0cc4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.com/pify?keyword=what+is+my+favorite+food', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL is sufficient to classify this as a malicious document likely used for phishing or malware delivery.

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=what+is+my+favorite+food
    • http://files.saujs.co.za/uploads/1/3/2/7/132712147/semuwagarutufa.pdf
    • http://nubiwagaz.comoxmobilemassage.ca/uploads/1/3/1/4/131407406/laseropuno-jadumexigosi-lumita.pdf
    • http://files.theapothetae.org/uploads/1/3/0/8/130814042/refobitubababofuxam.pdf
    • http://files.imijwardrobe.com/uploads/1/3/0/7/130775846/c40618891a0d7e1.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/54523386931.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/83876042794.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4843/files/paladin_5e_oathbreaker.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/grand_arena_swgoh.pdf
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/wild_steelbloom_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1062/files/the_playbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/rubidelimawobaluka.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/jajimerifotobepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/tamugik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/fotisokupiver.pdf
    • https://cdn.shopify.com/s/files/1/0432/7614/0710/files/1_page_no_koi.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_off0000652f.bin
54f6b05b626b66a21438f0160b4bf485dbdd08ab6438d1faf7f4007a25a30aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x652F 5288 bytes
font_01_sfnt_off00007718.bin
8b700118b333ddb54e80de6eb28edf0093afa0ca5722662ab827807df20a1418
pdf-font-stream PDF embedded font (sfnt) at offset 0x7718 10592 bytes