Malicious PDF — malware analysis report

Static analysis result for SHA-256 5345473d7ae45d85…

MALICIOUS

PDF

57.0 KB Created: 2020-08-12 09:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e31488e739ba0e6856cd435ab313e6fa SHA-1: a1a5889c004b99b592ca5d90609f1551a3bacf5c SHA-256: 5345473d7ae45d85c2ee505099a435bbd4f16fe4ed636e62ca8de355fb96c483
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.ru'. Another critical heuristic identified a PDF link farm, with 'cdn.shopify.com' being a dominant host. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the malicious URL and other links, suggesting a lure to external, potentially harmful, content.

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.ru/pify?keyword=lobo+hombre+boris+vian+libro+pdf
    • http://files.episcopalchurchonedisto.org/uploads/1/3/0/7/130739895/julusetiliwejo-nevadutijumud-niwikulobefeni-zupebewunesir.pdf
    • http://files.motivelove.com/uploads/1/3/0/7/130776728/9627091.pdf
    • http://files.pvbcn.org/uploads/1/3/1/8/131856883/4139356.pdf
    • http://dakem.newberrycoffeeroasters.com/uploads/1/3/1/0/131070420/701448.pdf
    • http://files.sierranevadapork.com/uploads/1/3/0/7/130776327/pexilimubibexagasuta.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/pifonavefibutejasejad.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/catholic_encyclopedia_vol_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/guia_de_adestramento_para_ces.pdf
    • https://cdn.shopify.com/s/files/1/0438/4007/7981/files/65962265572.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/wugemekabuxaxujo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7573/7502/files/34642539704.pdf
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/labizewusizado.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/5393820402.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/doxemaforopogokulin.pdf
    • https://cdn.shopify.com/s/files/1/0451/3719/9257/files/zalexidajod.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_off0000a1c4.bin
aa64a7170a84ac3411717b9b06c5d07c7fcbe1c0c403b1ca05efd3badffb1de3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C4 5420 bytes
font_01_sfnt_off0000b40c.bin
4cf99359778993368c40d5bebab46ee406f4ac058bdef45dce4364365ac153d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 10272 bytes