Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3221d51bdd07e58…

MALICIOUS

PDF

43.6 KB Created: 2020-07-27 00:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a3314ae955d38e0b18dfee569d9e02 SHA-1: c7c9d0d6349d6133a5e0f7835891bcd3d356df0f SHA-256: a3221d51bdd07e58b9158839d8d27289f4475a2d3ca3e2811f64ddc969d9fd6f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is a known malicious domain. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, with the first being to 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Vivah video hd apps', suggesting a lure for users interested in such applications.

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=vivah+video+hd+apps
    • http://files.sweettreeevents.com/uploads/1/3/0/8/130874394/0161cabd.pdf
    • http://files.learningonramps.org/uploads/1/3/1/0/131070407/mipigalukejolu.pdf
    • http://files.northeastinsulation.com/uploads/1/3/1/0/131071043/8a380dd0981.pdf
    • http://files.paperitbeautiful.com/uploads/1/3/0/9/130969985/096008955.pdf
    • http://files.paperitbeauti
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/fixer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/buxinirobufub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/75565140750.pdf
    • https://cdn.shopify.com/s/files/1/0433/4154/5626/files/6842574398.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6984/files/vesudikadamomulukadod.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/26801336991.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/nifitoxakatidug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/xapagorojofuwitonowitig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/57092456896.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/pawamad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/wadotowepazivo.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_off00006c36.bin
00b6575e43694b0b71603ea8878387e8d9ffb4083e208639a76c1b6d6a34c59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C36 4548 bytes
font_01_sfnt_off00007bb3.bin
6750560adabd5437427dc0d1fd4c2d4270783ac2ca2c20a036a4e40a275ad6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB3 11064 bytes

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