Malicious PDF — malware analysis report

Static analysis result for SHA-256 616c605631dab91a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-03 21:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24938593eeb33695bbdbb8add6b9328 SHA-1: 4b67a4c2d8d59a1854808924993ef4cdc6a08405 SHA-256: 616c605631dab91a815684cd91c92b1d8e8dc0e61fdffaeefe32a5aa66c9822f
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to link farms designed for SEO manipulation. One prominent link redirects to 'ttraff.cc', known malicious redirector infrastructure, disguised as a physiotherapy exercise PDF. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to drive traffic to malicious sites or potentially distribute further payloads.

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.cc/pify?keyword=meralgia+paresthetica+physio+exercises+pdf
    • http://files.bonding.no/uploads/1/3/1/6/131637606/1860893.pdf
    • http://files.insta-answer.com/uploads/1/3/1/4/131437873/bivimotikodixik-garovadaka.pdf
    • http://files.amanapopcornandicecream.com/uploads/1/3/0/8/130813325/e6d33b630b2dcd.pdf
    • http://files.casadeartegallery.com/uploads/1/3/0/8/130874554/wolol_lobowemuseji_bemutepugeno_zeroruj.pdf
    • http://files.protectthefalls.org/uploads/1/3/1/0/131070051/gugajunuriva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/disagonibetoxije.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/vubozujesibukevopan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/xidumil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/tonomebukizuvut.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/22634446472.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/minecraft_1._5_2_maps.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/regiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/canon_7d_firmware.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/wajebekewavejimena.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/kidijeri.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/21_jump_street_full_movie_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/65851604738.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_off00006cdb.bin
39008f4206966395c09b6000eb1dccd47203b147f67fee3f8e5c3a19595a4b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDB 5592 bytes
font_01_sfnt_off00007ffa.bin
c74becb3c7ea47bc23d9aa9cf32a30feb5d2fed0894b32db0305c67a97abcb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFA 10044 bytes

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