Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff304f71c492c99c…

MALICIOUS

PDF

52.6 KB Created: 2020-08-12 03:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87ec0789121295d99b1998b278199e8 SHA-1: 462991fe425dad0693d20a6849bf7ead77a0d70d SHA-256: ff304f71c492c99c58bfc85b9a98cb3b206c38b9934cd6266ebd31ad35152072
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 for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bsc mathematics books free download pdf' and the primary malicious URL. This suggests a phishing or scam attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=bsc+mathematics+books+free+download+pdf
    • http://pabiwom.nicoleforcouncil.com/uploads/1/3/1/4/131437615/3cc0498a98.pdf
    • http://nurozune.awarenessties.us/uploads/1/3/2/8/132815123/sazebuw-dulajozus-sovuv-fovop.pdf
    • http://files.tnmshop.org/uploads/1/3/1/0/131071151/a33d7621786e2.pdf
    • http://files.thebarllc.co/uploads/1/3/0/8/130874254/powafokuke_xeluna_kadot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/17491780933.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/board_of_education_v_earls.pdf
    • https://cdn.shopify.com/s/files/1/0449/6090/7423/files/jojejuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4053/8773/files/59010432789.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/nanaxerumodut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/30879163684.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/dulapafetul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/romexogevim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/kaxowegewomejozaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/atos_institucionais_ditadura.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/7405492822.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b6.bin
baa6aa0640b484256bdbd086e35afe35b0d67faefcb8c0a991f1cfb886d53eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B6 5740 bytes
font_01_sfnt_off00007519.bin
55635b50bad29c6b04cd9b4d5dd064b78be6c29eafc981c666da6fe4470a6799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7519 3204 bytes
font_02_sfnt_off00008209.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 2320 bytes
font_03_sfnt_off00008c59.bin
7b8d238d525cc804e7b0b1ff0e60628c2ee9e1306a00907a0c1b640c24e2bd74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 10088 bytes
font_04_sfnt_off0000aee9.bin
4362e686776cae9b5e877a8e5de4a1ff5ae9966626bcf1046762b8e3a01bbea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE9 16224 bytes

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