Malicious PDF — malware analysis report

Static analysis result for SHA-256 4039cb34a006e41f…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 11:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8174f048948b13961ecff4c18c62fb5 SHA-1: 96c15656ec30963613a22c0b1ac3438acb36fa2d SHA-256: 4039cb34a006e41ff87fb2c66ccca2b77a0f691089312c526cab79eceb59a55c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link. The document body also contains this URL, suggesting it is the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, including to Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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.com/pify?keyword=centre+de+formation+auxiliaire+de+vie+tunisie
    • http://files.christiefencing.co.uk/uploads/1/3/1/4/131408024/botulizulubi.pdf
    • http://files.elsvandeweyer.com/uploads/1/3/1/1/131164081/425bc8803.pdf
    • http://files.momandbabes.ca/uploads/1/3/1/6/131606027/3012439.pdf
    • https://cdn.shopify.com/s/files/1/0432/3593/4370/files/agneepath_video_songs_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/set_webview_background_color_transparent_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/free_heart_template_to_print.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/webbie_shawty_knows.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/91254510683.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/soul_worker_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/32470134623.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/xiguralijorasirititegixan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.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_off00005aed.bin
328ca49749417254496ab24d0208c2ea95a369586213d9db9c7fbbcb2caba88e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AED 5088 bytes
font_01_sfnt_off00006c23.bin
7b9a8744f7d780a15408f8203d31a4225311285787d321bded56d4c45f39f502
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C23 11784 bytes
font_02_sfnt_off0000912e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x912E 4324 bytes