Malicious PDF — malware analysis report

Static analysis result for SHA-256 32dcaa8320df291f…

MALICIOUS

PDF

37.2 KB Created: 2020-08-06 12:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d86b3c7e34fec23869ec754590c288a0 SHA-1: d90785314446ea020458a44201efad9cefb55bfb SHA-256: 32dcaa8320df291f89967687d17b68fac15205a2494e3b3c03890543b9658541
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, contains keywords related to the embedded URLs, suggesting a lure to a link farm designed for SEO manipulation and potential malware distribution. No scripts were extracted, but the primary attack vector appears to be the malicious redirection via embedded links.

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/wb?keyword=sheet%20metal%20pattern%20drafting%20and%20shop%20problems%20pdf
    • http://files.27waterfallsshoreexcursion.com/uploads/1/3/0/7/130739779/rizibijis_potikugopom_jedigu_mojon.pdf
    • http://raforelo.motivationalcheck.com/uploads/1/3/2/7/132710621/ritovalegedagika.pdf
    • http://fofoka.armaeroconsultants.com/uploads/1/3/2/6/132681579/tabesu_binuweva.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/65250225336.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/98964646831.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/lakimixebatek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/st_thomas_weather.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/fopoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/69226765305.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/paripurupoladukejikumebon.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/99235681900.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/dobowiruzuximup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/fawojasoxubipajojuluwo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9661/0718/files/paraxonebeseburosawuguju.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_off000052ca.bin
426494d87325d2868c7638654cbc84b9826874acf5e8cd2cfb77800c60eb9490
pdf-font-stream PDF embedded font (sfnt) at offset 0x52CA 5696 bytes
font_01_sfnt_off000065f1.bin
af64192c530d358ae1d3cb4a902c4d1514a16393b236c5e50d25b1b0107fc5f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 9976 bytes