Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8e8bc8956b5415…

MALICIOUS

PDF

45.5 KB Created: 2020-08-16 23:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92d736b9a5f126080eb58cc6635827e8 SHA-1: c41f7cab9e2fbd466e6fbc8bfe686b458d52eb74 SHA-256: 5d8e8bc8956b54156c4a01bc69b1106e7683144f9ffc48d986a8672f6228c665
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The presence of many external links suggests an attempt to create a link farm or distribute malicious content.

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=medicina+antroposofica+familiare+pdf
    • http://valelu.timeforchange-tfc.com/uploads/1/3/1/4/131409474/9613995.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5441/5515/files/rulikozofamumobaremudasef.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/kanorilima.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/edgar_allan_poe_libros_en_espanol.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/bevamewuguvisabisude.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/96421457663.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/amsterdam_schiphol_airport_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/duzel.pdf
    • https://cdn.shopify.com/s/files/1/0434/8647/8489/files/operation_management_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/wiwunad.pdf
    • https://cdn.shopify.com/s/files/1/0429/5645/6095/files/97733613450.pdf
    • https://cdn.shopify.com/s/files/1/0428/4825/6156/files/durekalewanugeseruk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663d.bin
56118d45ffd64db855d3abc3a7810e1a364f212511a14d66d3ad33d1a8bcbb9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 5092 bytes
font_01_sfnt_off00007765.bin
e6e7f10c8f30b98f653c9cbe75d15e8395a8fc637353c42b80a370823db59ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 11024 bytes
font_02_sfnt_off00009b1a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1A 4324 bytes