Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d86d59395391c8…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 05:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d90ae3c2df61097ddd6c30917bad3939 SHA-1: fb6278a9cb2be1d989c4ac44f786a13abe20f0df SHA-256: a3d86d59395391c8ff2e94e01b5f2238b25856d4f88f48beedeb7620d49a2ab4
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=n%25C3%25A9gritude+et+humanisme+pdf`. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The ML classifier also strongly indicated maliciousness.

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=n%25C3%25A9gritude+et+humanisme+pdf
    • http://kafevet.jssst.net/uploads/1/3/0/8/130873826/1018279.pdf
    • http://files.myintrinsicbeauty.com/uploads/1/3/1/4/131453068/pebidolivopulek.pdf
    • http://files.adrienneisakovic.com/uploads/1/3/1/4/131437283/85f3bb109.pdf
    • http://rireru.stcolumbasculloden.org/uploads/1/3/1/4/131453329/edc31fe84da.pdf
    • https://cdn.shopify.com/s/files/1/0450/7769/2581/files/pasion_segun_antigona_perez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/alexandra_kohan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/suffixes_worksheets_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/42281815693.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/fubokeva.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/suxelude.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2421/files/44508539976.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7137/files/auditing_assurance_services_7e.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/390165466.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_off00006103.bin
5f24e8d0f314bf4ee8bb083350963f69ec4d8055eae16306f518ecb36e92377a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6103 5308 bytes
font_01_sfnt_off000072a2.bin
924bbfcae74df0aebf75ff4503edc956d92e3578e8a729c5fce11d30a26fda39
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 12100 bytes
font_02_sfnt_off00009906.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9906 4324 bytes