Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd4c44e0168b1dd…

MALICIOUS

PDF

44.7 KB Created: 2020-08-18 20:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43f50ca01c8c56ffbd6681c8ca1a619 SHA-1: 97ae86716d5892903ca7addea780105d1fca4b8a SHA-256: fbd4c44e0168b1dd915a34a34a481b2e6d4b38640f7f72a62cf50e166d67544b
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=c.+v+format+2019'. Additionally, it exhibits a PDF link farm behavior, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the phishing or malware delivery intent.

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=c.+v+format+2019
    • http://files.drconsultinginc.com/uploads/1/3/0/8/130874493/mebijenivo.pdf
    • http://files.sharronbennettphotography.com/uploads/1/3/0/7/130776433/4243165.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/vumupakamusafufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/1006797837.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/nisijabufozibas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/21004549239.pdf
    • https://cdn.shopify.com/s/files/1/0438/1347/0365/files/blender_shortcuts_2._8.pdf
    • https://cdn.shopify.com/s/files/1/0432/4206/1986/files/free_english_comprehension_worksheets_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/12581761213.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/73916464382.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1799/files/62240095345.pdf
    • https://cdn.shopify.com/s/files/1/0430/4823/9257/files/29816119068.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/visigevibimo.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000728e.bin
bc06118c6902d753b2384a0fed56baa6ed9e28dc4d614f76359b3956c32e7ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 5180 bytes
font_01_sfnt_off00008422.bin
f24fde484d10ba104a96504178f9a9c4f9d5bb05ebb9b7504dd001b8ac269798
pdf-font-stream PDF embedded font (sfnt) at offset 0x8422 9996 bytes