Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8412d7bebafd24…

MALICIOUS

PDF

48.8 KB Created: 2020-08-20 08:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23239ae2c7ccfafcde998c04de91ac5c SHA-1: 8974e593e9397f685fe2a76d6dace0b8542a3eec SHA-256: bc8412d7bebafd24b4e9bf70a1d689bef41e4c936a77afd8bbdf8c167e14f7bd
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a search result for 'berserk volume 38 pdf'. This link points to `https://ttraff.ru/pify?keyword=berserk+volume+38+pdf`, which is flagged as malicious. The document also contains a large number of other PDF links, many hosted on shopify.com, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=berserk+volume+38+pdf
    • http://files.ucitownandgown.com/uploads/1/3/0/8/130813400/zadazasako_wesesop.pdf
    • http://files.wisefeline.com/uploads/1/3/1/4/131438784/dagaderimavixow-gozozibo-muwetopulibab.pdf
    • http://files.mychicagotailor.com/uploads/1/3/2/3/132302951/4853079.pdf
    • http://files.mrpadilla.net/uploads/1/3/1/3/131380158/ponazi_powagelira.pdf
    • http://bonogo.sthelenasportsday.com/uploads/1/3/2/7/132710601/mojuxovoxozudonoweg.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/17020776438.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/ala_baburao_dj_song_wapwon.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/gmo_essay.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/50209432004.pdf
    • https://cdn.shopify.com/s/files/1/0457/3695/1964/files/alligator_hunting_guides_in_alabama.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/sabapiwubopaviwuxateb.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/fifuvowivasaleboxijema.pdf
    • https://cdn.shopify.com/s/files/1/0449/4855/3887/files/formulario_ser_bachiller_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/ribuzipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/6393692059.pdf
    • https://cdn.shopify.com/s/files/1/0434/1389/7368/files/atkins_induction_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/nrmp_match_fellowship.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xubeke.pdf
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/dotefosused.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ab.bin
567785245ac8c48a8081ab0d3c573f4cfe183f6d5ea248ef48a10856f2931e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AB 3616 bytes
font_01_sfnt_off0000728c.bin
7cb37a131579a3fe57fad2b6607ecf6719ddabc720355a59d49a0c76356f3e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728C 5508 bytes
font_02_sfnt_off00008540.bin
575f07effd25217cf5fbffa9091a324f4952ad003f66eac9fad6f59884e789ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8540 15088 bytes

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