Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fbb07db7b90246…

MALICIOUS

PDF

39.8 KB Created: 2020-08-25 10:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0e54491a1069ec893a764a6f0cc6b4 SHA-1: ccbb1ba4b9a444f1f99ce43b77fd7491c4536960 SHA-256: 22fbb07db7b90246ec7a5e623c6619f70f6a0b8c46b5596fffca5f6337a6e734
152 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 'https://ttraff.cc/pify?keyword=variety+rice+recipes+in+tamil+language+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. Additionally, a PDF link farm heuristic suggests the document is designed to host numerous external links, likely for SEO manipulation or to distribute malware. The ML classifier also 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=variety+rice+recipes+in+tamil+language+pdf
    • http://files.liloli.org/uploads/1/3/0/8/130874360/sotazajas.pdf
    • http://valedujaw.personalpilates.co.nz/uploads/1/3/0/7/130775732/wexumumudivo.pdf
    • http://bawebimet.hellenphotography.com/uploads/1/3/0/7/130775666/lurikelebiroxo-mewefemafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/60745707660.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/monosacaridos_derivados.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/marathi_calendar_2020_august.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/jefikedativanisani.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/larutan_nutrisi_hidroponik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/sixesonowomuteveko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9994/7162/files/ycmou_admission_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/ramivinunezonogavejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/zufowedodagafona.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/77510778724.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/pixubidafujif.pdf
    • https://cdn.shopify.com/s/files/1/0433/6579/3942/files/52496889962.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/use_wifi_on_airplane_mode_android.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_off00005cf2.bin
4548fb21b08c5ff4966d1cb06c57122a839c01245e7ffdab892a02f9973ca328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF2 5540 bytes
font_01_sfnt_off00006fbd.bin
6fe9ad42de348e147e93a8d570c63f80cef045a7cfbc9b2bb0c7966450ed26d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBD 10016 bytes

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