Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b5b87e0b08b52f…

MALICIOUS

PDF

67.3 KB Created: 2020-08-19 10:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84674c3c7268d3b471e14d572cd9f020 SHA-1: d5c7c82cf9df00a0c2fd3e513ebeaca6387b0f91 SHA-256: 03b5b87e0b08b52fe018145a6c458a89cd778b1e7c386e294556e2149e00a7cd
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 firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics. The presence of many external PDF links suggests a link farm or redirection strategy. No scripts were extracted from this sample.

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.com/pify?keyword=singh+is+king+movie+song+320kbps
    • http://momapavat.simpliik.com/uploads/1/3/1/3/131398444/1353025.pdf
    • http://sewig.franklywithfaith.com/uploads/1/3/2/3/132303374/vubupotu_pomomameki_wadojurafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/sokoruzevodowopobadapi.pdf
    • https://cdn.shopify.com/s/files/1/0450/2539/4838/files/beading_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0440/6371/9574/files/78510108743.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/explosion_box_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/9013/9549/files/96415667026.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/bonolota_sen.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/gilemewegogupawizaziz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4446/0951/files/11055764642.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/digegura.pdf
    • https://cdn.shopify.com/s/files/1/0428/2309/0343/files/sleeper_cell_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/38145470358.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/58569299532.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/digestion_y_absorcion_de_lipidos.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_off0000aebd.bin
8df7c506b0d8d8edbb5f9defc70a11aca0cd5fb6c332949de81092b6f6c373c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 5408 bytes
font_01_sfnt_off0000c0e2.bin
2852701b213a1bafddd6c861f45028475bd63c11e62f3a09363f5b39ff6234d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E2 15432 bytes
font_02_sfnt_off0000f07d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 4324 bytes

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