Malicious PDF — malware analysis report

Static analysis result for SHA-256 392a221ca87214b9…

MALICIOUS

PDF

60.0 KB Created: 2020-08-23 22:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19bb275c0e9123be3b12043cf5e1637f SHA-1: b69b180d05e74e8f090cea056c4a05b36b28dda0 SHA-256: 392a221ca87214b9fb7750ab28d081d91a7c8e4253e11450b421074d77beaad1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, possibly for phishing or malware distribution.

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=cetylpyridinium+chloride+safety+data+sheet
    • http://files.padmasherni.org/uploads/1/3/1/1/131164452/b924cb36315c7.pdf
    • http://mumetulub.rnfotography.com/uploads/1/3/1/4/131438641/sanegugamebefox-fogojif.pdf
    • http://files.jennayvonne.com/uploads/1/3/2/7/132740488/rezedufisoraxob.pdf
    • http://lotaxeze.brookscrc.org/uploads/1/3/1/3/131383541/dovevis_lipivejosenosam_sadigut_medidejavafezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/rilekor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/10337607840.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/97235960073.pdf
    • https://cdn.shopify.com/s/files/1/0440/6027/8936/files/67347431344.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/very_hungry_caterpillar_printable_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/68223208543.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/blessed_assurance_sheet_music_key_of_a.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6460/files/alisa_vitti_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/jilawejubipasimiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/32014577846.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_off00009e84.bin
a3dcc37285e71d257bc32bf45ff03bab20273c777c23445d203cdecde91dfb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E84 5404 bytes
font_01_sfnt_off0000b0b9.bin
b9efe9d296a61750a6164f21b313994626d9125ceeb25b896664cb19240290b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 10608 bytes
font_02_sfnt_off0000d4e7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 4324 bytes

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