Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13f7075a9ca56f1…

MALICIOUS

PDF

36.2 KB Created: 2020-08-03 05:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 399d5439e1c36344bab5519d9802695c SHA-1: 5d4cf8b1b4399589b4948c65574ec1df75423268 SHA-256: d13f7075a9ca56f162bbc5dffcef95fdfd1075c3fc339a8ff0d42cc3bb04c400
152 Risk Score

Malware Insights

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

The PDF contains a lure for a "Geforce now activation code" and embeds numerous links. One of these links, https://ttraff.cc/pify?keyword=geforce+now+activation+code, points to known malicious redirector infrastructure. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the malicious nature of the embedded links. The ML classifier also strongly indicated maliciousness.

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=geforce+now+activation+code
    • http://files.fraterautomation.com/uploads/1/3/0/7/130775949/nisivogew.pdf
    • http://files.educatorsforsocialjustice.org/uploads/1/3/0/8/130874148/xojosifaniwa.pdf
    • http://files.majorkeys.org/uploads/1/3/1/4/131437849/8468945.pdf
    • http://files.purplecowquilting.com/uploads/1/3/0/8/130814902/4676421.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/40414022793.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/mivufetasotewawatol.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/xivudoropewonin.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/nidini.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/nonerok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7805/0201/files/45339759053.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/80802854131.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/stp_plush_acoustic.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/87164205756.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_off00004fd1.bin
05942a58bb95152812ef96b15651a94ad78e8a253da1b8a489dee9620da8e049
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD1 4988 bytes
font_01_sfnt_off000060f8.bin
6eeb85e8207e479ce910801f94b39cee9e7bc4a2a825ec54e087f5a4857bb5d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 10392 bytes