Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbcf67b8dba3c2b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-08 18:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb38eb20f0ec3a3b479f44b6b7fa0aa8 SHA-1: f0f19653e8dfb9e7c0c8d7c9f788137e1204a373 SHA-256: 8dbcf67b8dba3c2bdb017764bf33a5907c6b1d49e76858784a994d651ff9aba6
154 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=traditional+cinderella+story+pdf'. This, combined with a PDF link farm heuristic, indicates a likely attempt to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for the attack pattern.

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=traditional+cinderella+story+pdf
    • http://files.riverlandsequestrian.com/uploads/1/3/0/7/130775983/7468895.pdf
    • http://files.iaclals.com/uploads/1/3/0/9/130969080/cf69a4fc697f.pdf
    • http://files.mrkevinkimmel.com/uploads/1/3/0/8/130874588/saxalugijar-rebabiz-vadajes.pdf
    • http://files.ocholistictherapy.com/uploads/1/3/1/8/131856308/manexidetanose.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/43316770582.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/enlace_glucosidico.pdf
    • https://cdn.shopify.com/s/files/1/0445/3846/2372/files/time_dilation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/convert_to_fillable_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/vutabel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/xosidobirerasoluvevedapex.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/83379142741.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/alternating_current_machines.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/xigeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/70788852314.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/wasawotubi.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_off00007008.bin
79c197814003f11ad94edbac35ab19da1be749d6a081d857a31091295f4ccdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7008 5200 bytes
font_01_sfnt_off000081cc.bin
d82a62b0b538cdacae1cb8c7ac0409566fe6a6488da701d8ff99d2023fc46adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CC 10276 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.