Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cdaec8c3bcf9f1…

MALICIOUS

PDF

42.1 KB Created: 2020-08-02 07:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d54cf9139f36490faecf931a197a614a SHA-1: 63393bc6a31e98a890de3fc4f3b541335c8dab87 SHA-256: c4cdaec8c3bcf9f16025802e6743100122be93a9b45f851c6dc2da644af01014
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with the heuristic PDF_SEO_LINK_FARM indicating a link farm. One of the primary links, https://ttraff.ru/pify?keyword=roll20+change+avatar, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL and several Shopify-hosted PDF links, suggesting a lure or distribution mechanism.

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=roll20+change+avatar
    • http://files.pocketfulproductions.com/uploads/1/3/1/1/131164281/suturekavot.pdf
    • http://files.blaiseworld.com/uploads/1/3/0/7/130740586/2234365.pdf
    • http://files.fromsistertosister.com/uploads/1/3/0/7/130775462/c83a1aa.pdf
    • http://files.pyramusphotography.com/uploads/1/3/0/7/130740110/xowetaxadaludakeguja.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/89490353746.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/19284245085.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/lubalenexasepiwizapewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3457/3991/files/78424010475.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/soundcloud_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0440/6951/9510/files/milavowaporogiketutirax.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/48730902341.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/58539530034.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/84712642124.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_off000065be.bin
a9019698210335c261f1d06e919fbabee1c297fefb62ecdd9d0dc980c37ee80d
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5224 bytes
font_01_sfnt_off00007789.bin
4c19f47bbbba870b8ba41554f8b2f8e455a97aa64c844cbcc41083b1133f89b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7789 10620 bytes