Malicious PDF — malware analysis report

Static analysis result for SHA-256 932f21e9d7f3a38d…

MALICIOUS

PDF

70.2 KB Created: 2020-08-18 13:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad499449b281c7be34d9969a3c4a2de SHA-1: 9e7ca07f5f840fa6c808544bcc7291c42c56eb49 SHA-256: 932f21e9d7f3a38ded6f5d525ec6a1a7713b397fa27d20eeb74fb0ee2536c3f1
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=avicel+grades+pdf', which likely serves as a gateway to further malicious content or phishing pages. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The presence of a large number of external PDF links, many hosted on Shopify, suggests an attempt to leverage legitimate platforms for malicious 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=avicel+grades+pdf
    • http://files.nationalwhippetassociation.com/uploads/1/3/1/6/131636700/kexegaripipepo_pukulipefu_giturajigunipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/20069576721.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/27412484367.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/breadboard_circuits_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/chhattisgarhi_gana_karne_ke_liye.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5461/files/nasafeb.pdf
    • https://cdn.shopify.com/s/files/1/0447/9886/9653/files/biomes_of_north_america_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/wakenemanofewofopuxuzepif.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/the_fall_of_heaven_andrew_scott_cooper.pdf
    • https://cdn.shopify.com/s/files/1/0431/7996/6628/files/werelupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/tabel_bilangan_biner.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/96366696491.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/viduvukuzarogotomukub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/architecture_residential_drafting_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.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_off0000d511.bin
9305dc2c7d26aa8faec0a670ddbb87b08f7bf42deb8bde72fe87213934759bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 5372 bytes
font_01_sfnt_off0000e76a.bin
7da803026d50023a10faf0d1d7bfa89cc64ce3a77a43df1468ac5fb196e19ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 10616 bytes

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