Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7b939a3a9a324a…

MALICIOUS

PDF

50.7 KB Created: 2020-09-18 03:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97507b8a6a4a6343e91b9401b57e730d SHA-1: 40c5be89429100db5a8888e4938413ba55975ca1 SHA-256: 5e7b939a3a9a324a242c8111c77dfd060a2ae3214974d21d4ffa2d4bd80c3b1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lead the user to a compromised site. The presence of numerous PDF links further supports the SEO link farm heuristic, indicating a likely attempt to drive traffic to malicious content.

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.link/wix?keyword=worksheet+potential+energy+problems+answer+key
    • http://vitoxesuz.chrisscables.com/uploads/1/3/2/7/132710497/5352792.pdf
    • http://files.cdpirelandnetwork.net/uploads/1/3/1/3/131380292/8304244.pdf
    • http://labole.kardasystems.com/uploads/1/3/2/7/132740352/9925772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0074/9467/files/podujujilamaduz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/gegop.pdf
    • https://cdn.shopify.com/s/files/1/0434/7504/2457/files/rajasthan_patrika_bhilwara.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/asus_maximus_vi_hero_overclocking_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/mavi_en_scak_renktir_izle_trke_dublaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/96260356505.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/cbse_class_12_maths_question_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/encounter_shankar_movie_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/lalifodimoviteriguz.pdf
    • https://cdn.shopify.com/s/files/1/0480/8831/8116/files/57678038843.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000855e.bin
d84358e1a65b53e5c088398a3deed64fac0ac7406726824c2f9f59c5d99eba77
pdf-font-stream PDF embedded font (sfnt) at offset 0x855E 5644 bytes
font_01_sfnt_off00009884.bin
8065b389a08e097b3995894e03fa3c99349d78bfb1bcc66bb3d0fb68b862785f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9884 11272 bytes