Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e3c36a5539d086…

MALICIOUS

PDF

43.2 KB Created: 2020-08-13 19:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf9fab3218ca88f8911b65c4df0bb7a SHA-1: bc812c2c9b77893ffebce1e48846bd02371d80cc SHA-256: f2e3c36a5539d086fcb9af8b9a3f6a40d1d49d38b7ce2f594f26a87575ca120b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is also present in the document body. This suggests the primary intent is to redirect the user to a malicious site, likely for further exploitation or credential harvesting. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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/wb?keyword=rehras%20sahib%20path%20in%20english%20pdf
    • http://files.astriddrageset.com/uploads/1/3/1/4/131437276/988430.pdf
    • http://files.mycannablissonline.com/uploads/1/3/1/3/131382018/lurelu-wepepot.pdf
    • http://files.greensboroacrepair.com/uploads/1/3/1/8/131858540/duxizomifawoxojigub.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/risobunaku.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/disadvantages_of_systematic_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/kali_linux_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/54391551670.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7936/files/sudawofebizirozuwix.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8694/files/vunixisutakaborek.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/vetebunipad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/48034575435.pdf
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/banking_chronicle_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/singular_and_plural_nouns_worksheets_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/wibek.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/67712492739.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/kia_optima_manual.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_off00006ed0.bin
d4ecb22a6d2df87d2bb752d9586a96c12e4b0e9a262353ed0d9cd1eee2974ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 5452 bytes
font_01_sfnt_off00008148.bin
4ca29e816c605a095e2234e7c56f9e38e5944f709b40c85c3256b0dd2dec2a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 9068 bytes

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