Malicious PDF — malware analysis report

Static analysis result for SHA-256 386d8887d586e669…

MALICIOUS

PDF

38.7 KB Created: 2020-08-31 20:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01999775299c087d195ead9e1e38be44 SHA-1: 8b0180307470a189b2740f4023d10ef6a5d8a6bf SHA-256: 386d8887d586e669a51c0a279069d5ab4b20604f9dac1402b774fbe092b21660
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/pify?keyword=cool+lego+wallpapers+hd+free'. The document body, though heavily obfuscated, also contains this URL and text related to 'cool lego wallpapers', suggesting a lure. The presence of a large number of external PDF links, many pointing to Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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.link/pify?keyword=cool+lego+wallpapers+hd+free
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/16625799657.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/faxad.pdf
    • https://cdn.shopify.com/s/files/1/0437/7912/9501/files/91150769599.pdf
    • https://cdn.shopify.com/s/files/1/0460/2531/0367/files/babysitting_cream_latest_version_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/56626665256.pdf
    • https://cdn.shopify.com/s/files/1/0437/2702/8375/files/crazy_frogs_ringtones.pdf
    • https://cdn.shopify.com/s/files/1/0428/1047/4663/files/55061490474.pdf
    • https://cdn.shopify.com/s/files/1/0431/0918/7750/files/84448183005.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_off00005a75.bin
8668175e14c3319339519f2aab28c6c69537e1588e35863bc526afc1b5a658c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 5300 bytes
font_01_sfnt_off00006c84.bin
1989510b777bd170f90e3c552104897ae0054931fcbc7bb7624b9fd2f7dc0689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C84 9960 bytes

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