Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cfaab1b2dded79…

MALICIOUS

PDF

47.7 KB Created: 2020-08-21 01:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c6bb41cd90903e77a61b14569e8e21 SHA-1: b0e74b53736db7fede0d65007ee039e9d5228e8c SHA-256: 51cfaab1b2dded7998495c3a4fd73f79b0391ac89f52bbea9f79b230c3c82a03
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=blood+money+movie++free', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the ultimate malicious destination.

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=blood+money+movie++free
    • http://files.fritzcornmaze.com/uploads/1/3/2/8/132815206/liluragotuxu_mepuvopubupur_tanokiluninapu.pdf
    • http://files.hkarlssonjewelrydesign.com/uploads/1/3/0/7/130738637/zatabefimi.pdf
    • http://files.mariosmathtutoring.com/uploads/1/3/0/8/130874046/zivajezak.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/74572729542.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/begakuriri.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3970/files/75681417168.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/guvadopolesivisigabu.pdf
    • https://cdn.shopify.com/s/files/1/0461/8954/3582/files/jiwivinavoruligidukepuv.pdf
    • https://cdn.shopify.com/s/files/1/0456/8258/9855/files/basic_electrical_engineering_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/foxobiresorisiluki.pdf
    • https://cdn.shopify.com/s/files/1/0436/3098/5376/files/47612367552.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/52219870985.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/12610075325.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/luked.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/kagosaxevewevulivewuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/billie_holiday_biography.pdf
    • https://cdn.shopify.com/s/files/1/0447/9719/8487/files/can_u_feel_the_love_tonight_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/55447773655.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_off00005ffe.bin
0d959c59818529af5a65a41a3327cb26a388f1a5c5c772f0dda1848b332ddfa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFE 4876 bytes
font_01_sfnt_off0000708e.bin
1cd0e4e2f1b8039fc9d1107766dd8396c5144d744acb495b610020f1ddf280cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 10896 bytes
font_02_sfnt_off00009610.bin
ffb9d7af646f8daf2440fbfa076898317fbfc254c5c459a2d8eaa9c7c5e7ac72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9610 17980 bytes

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