Malicious PDF — malware analysis report

Static analysis result for SHA-256 f319c833000782ff…

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 19:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e64f240f440082e469333a8c40dd3e38 SHA-1: fb445ad4f072e80769f5b97bac554d84500a44b7 SHA-256: f319c833000782ff8b2041430cfba374b75892cc9d941a69898f27becd824e80
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 30 external PDF files, with one primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'A word wallpaper hd' and the malicious URL, suggesting a lure for users to download content that ultimately leads to malicious infrastructure. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=a+word+wallpaper+hd
    • http://walofu.didintle.online/uploads/1/3/0/7/130776158/zisajuf-wuwuziludojob-liwad-kowufepi.pdf
    • http://kovomi.oabtrucker.com/uploads/1/3/2/6/132681670/parur-setogexuneki-wivokifafatuf-kasenuluxen.pdf
    • http://tupez.diamondhomes.net/uploads/1/3/1/3/131384609/3380089.pdf
    • http://files.choosejoyanyway.org/uploads/1/3/1/4/131437949/80acb94d6807.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/rekexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/25561745541.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/topudesusimubudesibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3335/files/68109989430.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/bleacher_report_ny_knicks.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/29935262815.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/82402942416.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/zakopedomosekali.pdf
    • https://cdn.shopify.com/s/files/1/0437/9194/1781/files/nawogadimiwogegitalalozun.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/twitch_ban_checker.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/13106878577.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/34834222206.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_off000065b7.bin
86557c4b2ba9dc16cfbd19dc2336183f775c0443880dd0e7661dc67cc7f84e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 4504 bytes
font_01_sfnt_off00007518.bin
bbc0243ec2491727c71ea7c012a42541f25f135fd53d8bbf54b8c914d1b7e08a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7518 10288 bytes
font_02_sfnt_off00009818.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9818 4324 bytes

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