Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffc4ffbead89fa…

MALICIOUS

PDF

50.2 KB Created: 2020-07-29 13:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc06fa25912484993d74359055a3966a SHA-1: 482f974a2da127468215fbd34ec59b8231af06af SHA-256: b8ffc4ffbead89fa51be1cc1acabc02ea46894bcfd4ad63544408024f041ef92
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, many hosted on Shopify. One of the primary links redirects to a known malicious redirector. This indicates a link farm or SEO poisoning attack, designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=a+multivariate+model+of+strategic+asset+allocation+pdf
    • http://files.drlouiefrodriguez.com/uploads/1/3/0/7/130775387/tonixegolak.pdf
    • http://files.mysticsilverglass.com/uploads/1/3/0/7/130740193/rasomotonibi.pdf
    • http://files.stlcreativelandscapes.com/uploads/1/3/1/3/131378952/kifuwunumizud-mavedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/werinubib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/jipafonuletesolex.pdf
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/doxakarozagobufaxubunudo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/jakapadefogugugeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/72387977417.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/50095990360.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/telesonoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/tosedexawejepiliwikalux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/xunoboni.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/1/0427/9032/2335/files/jipafonuletesolex.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008668.bin
9105e765ee3c0b1d503b62d4eabbba49578ddc006b59ab47bdfc5b96894c87fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8668 5408 bytes
font_01_sfnt_off000098ba.bin
cbeded2b6ac9494a83dd3a3e9b75bb44ffcdb6aea5deaa48c0b3fe3a89fa45ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x98BA 10184 bytes