Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cda2c752b8935a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-05 01:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f364564d5af13027b3ff923e3eca9b54 SHA-1: 1c44343e8bca588d8fc72577885d9aee90342d6b SHA-256: 39cda2c752b8935ab7cf4f24302771d10528458a3725c18d749c5bbf049a5506
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links redirects to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the text 'adirondack chair plans pdf free' and the malicious redirector URL, indicating a lure for users seeking free plans. 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.cc/pify?keyword=adirondack+chair+plans+pdf+free
    • http://files.leahkriggmosaics.com/uploads/1/3/0/9/130969938/b4a535794d902ef.pdf
    • http://files.pennstatebabylab.com/uploads/1/3/1/4/131406274/kabelemawuw_pomiwezawo.pdf
    • http://files.englishwithcleek.com/uploads/1/3/2/7/132710779/zuzukoba.pdf
    • http://files.amravic.com.au/uploads/1/3/1/4/131453156/sasajapuvoxapodinol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/42576635151.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/12433637207.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/86558851590.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/34471113681.pdf
    • https://cdn.shopify.com/s/files/1/0438/3644/0726/files/40335988972.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/60765982001.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/80178655070.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/39188398360.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/zadudemixujegomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/88647030472.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_off0000613d.bin
06ed3bc7d914cba86474c5427f29ef3dc2826e52f9d1a39014b75673454448ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x613D 5296 bytes
font_01_sfnt_off0000733b.bin
41f1b7d4e036fe6c4237964fa2516c7f959d3d1c54d7ade3d2f83c073aaf8542
pdf-font-stream PDF embedded font (sfnt) at offset 0x733B 9976 bytes