Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac031327a34e000e…

MALICIOUS

PDF

36.8 KB Created: 2020-08-17 07:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3ef9035f5728dd213a2428a3d43006 SHA-1: 2825dcc9f8d2c2151429bcd2be5c33a8584080d4 SHA-256: ac031327a34e000ef655d82c731808d8e5fbd3917a32f706b58a2f2d57a97aad
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs. One critical heuristic identified a link to a known malicious redirector, ttraff.com. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites. No scripts were extracted, and the document body is heavily obfuscated.

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=cartoon+comedy+video++3gp
    • http://sujanuw.clydemarconstruction.com/uploads/1/3/2/7/132740405/mojekenaza_gidopakig_jipilumaponi.pdf
    • http://files.hairts.com/uploads/1/3/0/8/130813827/sopaligol-vumedi.pdf
    • http://zejuk.calicojacksnaturals.com/uploads/1/3/0/9/130969205/mojesikojudebew-mopexetewinoves-detilekejorijap-diwaruve.pdf
    • http://imgfil.com/198193
    • https://cdn.shopify.com/s/files/1/0451/1626/0517/files/profile_picture_for_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/gmat_sample_test_papers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/63528777145.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/ioun_stone_reserve.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/99280617688.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/739777412.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7345/files/18864038353.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/3285683485.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6124/files/2056377211.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/screen_list_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/rijef.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/satyanarayana_biochemistry_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/download_asmaul_husna_1_lembar.pdf
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/python_replace_space_with_underscore.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/
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/python_replace_space_with_under

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005068.bin
30bd01f09f60170a80b540812975a81a21a7b463adae7f8610b742b29ead495f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5068 5412 bytes
font_01_sfnt_off000062d0.bin
9a374992cf0d27dbf5a96ded850b41a7442c0fb9a4eeb151e79c985117ed6f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 10388 bytes

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