Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c8f2af4fcd7669…

MALICIOUS

PDF

48.7 KB Created: 2020-08-07 20:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf595db13be4892cc058aebd41ab93cf SHA-1: e65558125e5686b284564c9411ee11e605819433 SHA-256: 28c8f2af4fcd76698c4e2c716335f04cf4d1215374bfdff94219f65956f051b8
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 Shopify domains hosting other PDFs, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.cc`. The document body, though heavily obfuscated, contains references to the game 'Bard's Tale 2' and the malicious URL, indicating a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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=bard+s+tale+2+manual+pdf
    • http://files.theprideofmayfield.org/uploads/1/3/1/3/131380258/ralaborojusamujosu.pdf
    • http://files.p-l-a-i-d.net/uploads/1/3/1/4/131437094/gutixikumejunis.pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/53488484775.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/puxowabubomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/26443252833.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/lopud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/sosevurogavefogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/tea_released_tests.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7520/files/pibawafujeximavekilav.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/68237229769.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/65061203801.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/pozegiji.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_off0000810a.bin
bbb646e040f96c82883e1df9dea736c54d0480fa6d3259d3a3444052db5541b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x810A 5368 bytes
font_01_sfnt_off00009334.bin
e1c31c137e7ed7dc5f8168b6b1e8da3cdd7cfb33af1766b18f05ed1d961483a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9334 10340 bytes