Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae37d9a259d6168…

MALICIOUS

PDF

36.9 KB Created: 2020-08-05 18:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b9a68e29719c1718c0da780cbd7b62f SHA-1: 3e7cb67084ed4e18197f7505c326b49967a9e679 SHA-256: bae37d9a259d6168deba3406e26f92c65254e1b159f37defe2642e61c5b397f9
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as educational material. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to malicious sites. The ML classifier also strongly indicated maliciousness. 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.cc/pify?keyword=cambridge+igcse+science+pdf
    • http://tivevut.berndvandermeulen.eu/uploads/1/3/1/4/131407005/vumusazelir.pdf
    • http://files.knoxhi.com/uploads/1/3/0/7/130775942/6428251.pdf
    • http://mojula.namastefilmproductions.com/uploads/1/3/1/3/131379578/butexuwuvifafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/lonirojapozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/40356796146.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/nezapanokod.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/perkys_calling_remix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/23976016917.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/vijifasuvuvugobezaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/service_marketing_concepts_strategies_and_cases.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/fojiverutofelugeguniv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6372/files/hunter_classic_bis.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/13108389694.pdf
    • https://cdn.shopify.com/s/files/1/0436/8157/9161/files/ffmpeg_mkv_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/venogukixiveb.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/22406057513.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_off00005323.bin
28e5f51dab560bcedb83363aaefeb24274902f74c91613bf5755f11d3b1f12a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5323 5488 bytes
font_01_sfnt_off000065aa.bin
1683a28adfbde4a9f71c88baba2ce57f8c5d4fabe5e65756afaaf1a6ff9654fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 9704 bytes