Malicious PDF — malware analysis report

Static analysis result for SHA-256 8416a0976e1a23b7…

MALICIOUS

PDF

41.8 KB Created: 2020-10-08 15:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c371ae7eb703893c3737196e7b079f0 SHA-1: 47111bc1fb89e7f76ad0fe16dace42c6c31b6ac8 SHA-256: 8416a0976e1a23b797ddd60aacad90db30674ea7dfdeee02cbde06c3bf20d113
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.link/pify?keyword=fangirl+by+rainbow+rowell+pdf'. This indicates the document is designed to redirect users to malicious sites. Additionally, a PDF link farm heuristic fired, suggesting the document contains numerous external links, with the primary one leading to 'https://uploads.strikinglycdn.com/files/0402c9fd-4a3f-4766-9256-da8aeb8fa269/92540631893.pdf'. The ML classifier also strongly flagged this PDF as malicious.

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.link/pify?keyword=fangirl+by+rainbow+rowell+pdf
    • https://site-1037069.mozfiles.com/files/1037069/wozefujile.pdf
    • https://site-1038738.mozfiles.com/files/1038738/nomigafidewu.pdf
    • https://site-1039332.mozfiles.com/files/1039332/dazuvowovururaxebejer.pdf
    • https://site-1036764.mozfiles.com/files/1036764/demilesugavipezifizupabuz.pdf
    • https://site-1038670.mozfiles.com/files/1038670/71440585847.pdf
    • https://uploads.strikinglycdn.com/files/0402c9fd-4a3f-4766-9256-da8aeb8fa269/92540631893.pdf
    • https://uploads.strikinglycdn.com/files/80fbb995-ec6d-4fb6-bb12-a856eab51751/63270944051.pdf
    • https://uploads.strikinglycdn.com/files/434ac075-ddcf-4379-bc01-754fc9e99256/49370563213.pdf
    • https://uploads.strikinglycdn.com/files/b6ec573a-1963-4a97-865e-5a99d939633e/dobuzojirimozawo.pdf
    • https://uploads.strikinglycdn.com/files/78d3a9e9-eadc-40f4-b986-909f149e24c2/kepumexofudasozelup.pdf
    • https://uploads.strikinglycdn.com/files/a4d224d0-c138-4055-8cbb-08cc5449e1b0/97284558915.pdf
    • https://uploads.strikinglycdn.com/files/8efa30c5-c847-47a9-8d36-7135e84df37e/mosufixenokuregotedasivu.pdf
    • https://uploads.strikinglycdn.com/files/7bdc9348-0e97-4747-be64-9d3659bf3643/folenedabibimabotolepara.pdf
    • https://uploads.strikinglycdn.com/files/ce005160-595f-4998-9558-4cc74d17d95c/nufuso.pdf
    • https://cdn.shopify.com/s/files/1/0486/9727/8614/files/21786518473.pdf
    • https://cdn.shopify.com/s/files/1/0483/8060/8669/files/watch_mission_impossible_4_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0484/6809/9222/files/zuwigaguleguzupetafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8063/files/xedewezomodupavojijo.pdf
    • https://cdn.shopify.com/s/files/1/0484/1472/0152/files/csi_web_adventures_case_4_answer_key.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/1/0484/6809/9222/files/zuwigagu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006648.bin
521c5b195aada41821c9715fc0dec0e861a430b82abf250ad838e2139b748500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6648 5320 bytes
font_01_sfnt_off00007885.bin
ba6c7683a7b438ad9e9f6fd41ac775fe6437aa7747e135200bb5ed24c7251b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 9888 bytes

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