Malicious PDF — malware analysis report

Static analysis result for SHA-256 975fffac7c85ae91…

MALICIOUS

PDF

71.7 KB Created: 2020-08-31 03:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc9017f28cc7e2e7e88458c262ba77e SHA-1: 725f536d348817dc57ef96846e5bfbe623a800cd SHA-256: 975fffac7c85ae91ecea845d221a98ddd0d83c8024da7c7010ea605195dcffa4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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/wix?keyword=the+faithful+executioner+pdf
    • https://static.usrfiles.com/ugd/0c41e7_71b784acffa1488fbb474907d3c6dacd.pdf
    • https://static.usrfiles.com/ugd/efb3f0_e33167ca273c4ab795682392e29b2569.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0ac459034d44cfb887ca47771c862cd.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/kujurojelawavavowimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/kovanide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5265/files/rizubuwiguzuvesud.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/catheter_related_bloodstream_infection.pdf
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/52156829670.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8538/files/divisoria_shopping_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/anodizing_stainless_steel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3547/5624/files/kegajorexiduronokagapuxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a1.bin
4a321ec2273f6d0002a0ed05eb7d20d867f9210db5640fdf6ba1550ebdf0603d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A1 5080 bytes
font_01_sfnt_off0000d6df.bin
c87b055fe9cc0d8d76504c5f43ce54ed470a351cc9d6bd574f94bc4b27ba214c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10704 bytes
font_02_sfnt_off0000fbb8.bin
dfeebb44cf16d337e82d4774cb181783b8bf2674c4649c62238462e69ef025ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 16452 bytes