Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fe4cb3c64735ce…

MALICIOUS

PDF

45.0 KB Created: 2020-08-01 18:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aab2f990dd16e77d4164cce612081ec5 SHA-1: 715b326709c4af4461de165fe225461e6329ed1c SHA-256: 13fe4cb3c64735cec0bec00c9eb34e36f2dbd312ff62f341c8870587d3c84be9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, classifying it as a link farm. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination and potentially deliver malware or phishing content. The ML classifier also strongly indicated maliciousness.

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=javascript+get+type+of+object
    • http://files.pcconfections.com/uploads/1/3/0/7/130738848/5887712.pdf
    • http://files.julioespinosamusic.com/uploads/1/3/2/8/132815298/0a4b279.pdf
    • http://files.jgulbrandsen.com/uploads/1/3/0/8/130813108/4b0adf.pdf
    • http://files.manageyourpain.co.uk/uploads/1/3/1/4/131407887/196a252933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/jupezujitutulenapuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/free_mahjong_games_online_without_downloading.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8174/files/76129631137.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/11982087400.pdf
    • https://cdn.shopify.com/s/files/1/0433/5370/2550/files/67550494892.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/zoterora.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/mojokal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/wunixuza.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/53719928528.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/mixudafegidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/bufovugisejibezobuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/shopsmith_mark_v_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/gavabalologokasipatusel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ledoviz.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ec.bin
16d062f6a39dfe914b7550d43734caff22940b0e2d469dcc6ecb5b816b48f052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 5516 bytes
font_01_sfnt_off000077ce.bin
a511fb262e2f240b0cc62b800179189f1c69c7b4d67d938f9bc0c5e12ef74554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 2024 bytes
font_02_sfnt_off00008163.bin
659cbb24a8a323e3ab314472a92137854ccbd9e125830660d073f90dc220fd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 11536 bytes

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