Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cfdae30ec8e138…

MALICIOUS

PDF

33.0 KB Created: 2020-08-24 21:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f92dd3193757e916013d91c9930cc7 SHA-1: 1b4297ff705b069432286f0a33f5e1512f80e82b SHA-256: b4cfdae30ec8e138d5a7bbbe620084bbc12b6b8264858a6d20f384b54c442e8b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector suggest a delivery mechanism for further compromise.

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=emulator+for+gba+2++for+android
    • http://files.stevenr.co/uploads/1/3/1/8/131858044/5837126.pdf
    • http://wixobut.warzonecomicswzc.com/uploads/1/3/2/8/132815732/pigalixugozopukuvego.pdf
    • https://cdn.shopify.com/s/files/1/0450/1697/3476/files/pop_sonda_vesical_de_alivio.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/61087214838.pdf
    • https://cdn.shopify.com/s/files/1/0433/9446/5948/files/rotational_symmetry_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/runescape_combat_training.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/xakepeturatotiwoximeboz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/46856838606.pdf
    • https://cdn.shopify.com/s/files/1/0433/2778/3080/files/sozuwozikemowipozorometux.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/welujujosiwufijikanakifu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/46916710939.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/75307309414.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/artificial_intelligence_by_rich_and_knight.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/19421745125.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/tesulorora.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_off000043e8.bin
ea697891184ea48abec27d038b1ac74dc8c2dc546f65697a4fb0771754b0e055
pdf-font-stream PDF embedded font (sfnt) at offset 0x43E8 5276 bytes
font_01_sfnt_off000055c2.bin
319faa12ce59cd938d5c8f45f8d08cbf41d6f8b3a374470e44b6b737782c0f10
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C2 9864 bytes