Malicious PDF — malware analysis report

Static analysis result for SHA-256 53779f6dc118ac80…

MALICIOUS

PDF

48.2 KB Created: 2020-08-21 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2723014f0efee85d7be8f4d929c3d7 SHA-1: 7c5f0ca5b54dd9448e670b7844fb3ef6c66e944c SHA-256: 53779f6dc118ac80204f79d574db45337f60a622a745f4209a24a67d7428f2e6
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, includes the text 'Bug bounty hunter guide' and the same malicious URL. The file also contains a link farm of 13 external PDF links, many hosted on Shopify, suggesting an attempt to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=bug+bounty+hunter+guide
    • http://files.dmrproductions.online/uploads/1/3/1/3/131378838/9628368.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/difepemegitupodifaloko.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/67431431958.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/fallout_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7634/4225/files/pokemon_y_3ds_emulator_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/porojawamaziwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/95210842673.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/bitmap_get_type_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/lanuresubavigugufe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/fimaketufuzunamikiwok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/66075448246.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/buletogefugomonefopafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/ankle_injury_exercises.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_off000073fc.bin
4edda9d81017eac616007f0bb9f000c19f37a5f245f40c96160f0e4d6798db21
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 4960 bytes
font_01_sfnt_off000084d1.bin
076c971df2cec14dac56e58eccd25bbb215307626da622693ac0d2967cc3a292
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D1 1768 bytes
font_02_sfnt_off00008d9b.bin
0632571fb0eceb727ab0460fa7932a0c1d0233e49a6599bdf7ac76d540d4bad4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9B 11120 bytes