Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca60c41a4c97c6d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-15 00:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c4880f21e3f33ce03221f11387b961 SHA-1: 3ba40843ced2176b53e9d5eb7bfed4781cc93368 SHA-256: aca60c41a4c97c6d02c7b0b2894e4a1d90d485377f2fc677f14a0f27755d0634
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains that host further PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'free movies' and a URL that mirrors the malicious redirector, indicating a lure to trick users into clicking malicious links. 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=free+movies++websites+name
    • http://subipuxig.eastsyracusefreelibrary.org/uploads/1/3/1/4/131482993/9235193.pdf
    • http://diwames.soap-architects.com/uploads/1/3/2/6/132682787/vixizeginirud.pdf
    • http://fimojogav.kdefensemartialarts.com/uploads/1/3/0/8/130814397/momutiminerexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/cambio_climatico_en_el_mundo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/lijenitekiximovamonabobo.pdf
    • https://cdn.shopify.com/s/files/1/0447/0344/9241/files/how_to_restring_echo_trimmer_srm-_225.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/16454823545.pdf
    • https://cdn.shopify.com/s/files/1/0449/3590/5448/files/maplestory_cygnus_knights_skill_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/xanunedujibitulejewiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/jutemimomafivuzavi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/mini_cricket_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/87583658324.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/vomijixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/69519539636.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8077/files/73838069617.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a93.bin
73cc8146c34170ea8325accc98a40f615779625f7d1f4552a7b066f82a8f5dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 5044 bytes
font_01_sfnt_off00007bb9.bin
74069abf5b0d9bff08df24d8861bc6c8368b3dffb977407889b54908d2bf8c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB9 11140 bytes

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