Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dea1ecd27d0ef2e…

MALICIOUS

PDF

50.4 KB Created: 2020-08-10 14:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3550786dd75f67c732dba0ef23d0bdbc SHA-1: c6a52e39d03a9fe04599d6e02308c8b0e507caaf SHA-256: 4dea1ecd27d0ef2ec5b78eb652055aee79bb921ee731a6bc52227f1397f2d0dc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.ru. The document body, though obfuscated, contains the target URL, suggesting the primary goal is to redirect the user 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.ru/pify?keyword=que+es+alodinia+pdf
    • http://tiguzinox.mary-johnson.com/uploads/1/3/1/3/131379591/4859785.pdf
    • http://files.certainperfectratio.com/uploads/1/3/1/6/131637125/fapilowetelaji.pdf
    • http://files.medalmulisha.com/uploads/1/3/1/8/131856318/0a9e905efb0ab6.pdf
    • http://files.ascensionhousehk.com/uploads/1/3/2/7/132712306/8735681.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/5130916984.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/18832682232.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/aide_mmoire_math_9_10_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/saxusup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/80411988635.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/90902625131.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/bazaxuxatesetasimiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/widakoniwimotij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/the_metabolic_syndrome_prevalence_in_worldwide_populations.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_off00007a3a.bin
c8b3f7923c52a728372ac61f794422487f1db8a3623a13eba1f4ac67390fe6bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3A 5000 bytes
font_01_sfnt_off00008b52.bin
66b9ec34d83743417b3905357a83a483787b18c5c9e7a908d0244b0db99c1d36
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B52 16092 bytes