Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d515ba2651955e…

MALICIOUS

PDF

35.8 KB Created: 2020-08-14 01:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139afb541297beb0f723b09b3c90a99f SHA-1: 2377ca4d7f6f08efbd6dadafee16ca4452bad094 SHA-256: 03d515ba2651955e2958ab4b0192312a75a729ecc9b7d1eec9d4d68348c3e7ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is designed to drive traffic to malicious sites, potentially for SEO spam or phishing. 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.com/pify?keyword=obusforme+driver%2527+s+seat+cushion
    • http://files.loveadventureyoga.com/uploads/1/3/2/7/132740281/kodanum.pdf
    • http://files.probisma.com/uploads/1/3/1/4/131437680/9829656.pdf
    • http://files.redeemerlutheranhenderson.org/uploads/1/3/1/4/131406344/696509.pdf
    • http://saruxoro.highwaywalkers.com/uploads/1/3/1/6/131606066/7022448.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/26426903647.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/wiwojogarojideren.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/bryant_oden_the_duck_song_3.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/96420093481.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/70556189295.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/pojonepuxure.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/advantages_and_disadvantages_of_tourism_in_kerala.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/dogodunowosagikizugirepuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/70539724048.pdf
    • https://cdn.shopify.com/s/files/1/0438/3598/1974/files/biw_fixture_design_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/abstract_reasoning_test_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cef.bin
61b70ce0c696b3b48982978a11742606b4456c2ebab34b680e7c52b95bcfc741
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CEF 5488 bytes
font_01_sfnt_off00005f7a.bin
54a9ce5a387cb4c932e48d91ad37cae6b372fd1a70665e15bbe24f653a81d4fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 10136 bytes