Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20095115a218f77…

MALICIOUS

PDF

56.8 KB Created: 2020-08-10 13:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb36aea8e2e022a209da9d494821fbb5 SHA-1: 21b6c53e16bb29c2a77357f519dc6dd9e89c3e28 SHA-256: d20095115a218f77acd1aace14dc5fa80d3f9da2d09ba107623d9b839404049e
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=ecological+species+concept+pdf, which is also listed as a malicious redirector. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm designed to improve search engine rankings, likely to distribute malicious content.

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=ecological+species+concept+pdf
    • http://files.saintjosephscatholicchurch.org/uploads/1/3/2/6/132682404/91a8874c02.pdf
    • http://disapavud.topchoiceinspectors.com/uploads/1/3/2/6/132681342/9783342.pdf
    • http://tonun.bennettclansculpture.com/uploads/1/3/1/0/131070420/wekixalamowi.pdf
    • http://bopidi.ninthdistrictdems.com/uploads/1/3/1/4/131406202/dosurafaboginogula.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/kesojijaloxijariv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/mtgo_daily_results.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/82118852329.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/9820020863.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/55321605320.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/essentials_of_investments_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/18514420709.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/xefasul.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/xutugevezekemug.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/53460134803.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/33748634271.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/hydraulic_accumulator_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/calistenia_y_street_workout.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_off0000a10a.bin
bbc3def1686749f27f7dbbb6feead808ce26a20ad2a45beb8928701458ea1578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA10A 5184 bytes
font_01_sfnt_off0000b2c3.bin
502855df2c186b298447b8e8bca22e48ebdcbf4e4e03559fda14fe0d592aaacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 10316 bytes

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