Malicious PDF — malware analysis report

Static analysis result for SHA-256 5864dbe240813c0f…

MALICIOUS

PDF

66.8 KB Created: 2020-08-04 14:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23bf105460bae5a4a2b622fa0cfe1134 SHA-1: 0b44bf0d2079741b1ca74a07a54094ffe43db931 SHA-256: 5864dbe240813c0f1f249d47d5c5572e2c1526f9a7cd1e850d79524e40f8b45c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that promises a free PDF download. This URL is embedded within the document's body text, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous Shopify URLs, while many are benign, indicates a pattern of hosting content on such platforms for distribution.

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=a+brief+history+of+time+by+stephen+hawking+free+pdf
    • http://files.itsallfunandjames.com/uploads/1/3/1/4/131453484/5405921.pdf
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdf
    • http://files.enermotech.com/uploads/1/3/2/7/132710565/rekoboduxokotiloku.pdf
    • http://files.yestojesus.net/uploads/1/3/2/6/132695329/8303317.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/52462464822.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/bopinosukipopibijobowotib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/tuwagudadowibukujazesimus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/27184431149.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/24535051282.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/survivor_series_1996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.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_off0000b68f.bin
79fae04838ecd30c37787d37d5a31147866a4587f835cd900a0f46b689c2847f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 5808 bytes
font_01_sfnt_off0000ca37.bin
488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 6148 bytes
font_02_sfnt_off0000da17.bin
0b587ef2bab03325ff5e0f62ab3ee9e714c0dd096973f161308d26cd0f9dcbda
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10260 bytes