Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28cecad8f5ce80b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-23 21:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311fbbc32f3146ed9f1b6c79c94e3edc SHA-1: c35d939ab027a87834c413f06bafb8140338e686 SHA-256: e28cecad8f5ce80b271f46d75ce7e8817adc6213c8a6adb94c6a529fdd1a9f46
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for a game mod download. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further payload delivery or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=counter+terrorist+hunter+shoot+mod+apk
    • http://files.mystreetstamp.com/uploads/1/3/1/3/131379567/jegodadafutasaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/zolotenorotop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/xunijekumigoxiteto.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/can_satellite_cansat_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0844/2020/files/36745049187.pdf
    • https://cdn.shopify.com/s/files/1/0436/8157/9161/files/inside_actors_studio_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/tivenizapekezidoteviguga.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/exercices_sur_le_passe_compose_avec_etre_et_avoir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/bijekakibudadivetibove.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/tufilamug.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/96126913566.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.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_off00005528.bin
ef7c240c19e7ea274ab91d02a91ab15126e2257881e19cb9c64219ef9af18877
pdf-font-stream PDF embedded font (sfnt) at offset 0x5528 5136 bytes
font_01_sfnt_off0000666c.bin
7276062d2de7fe9311e2457e8cb749216aa50b5a3a3e067faf595ef288b8c5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 10236 bytes