Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94752f4e3c37bba…

MALICIOUS

PDF

42.1 KB Created: 2020-10-03 07:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 14c8a842a7b0852488a4947f0468d132 SHA-1: 8e9d219fa80195561e5d2009f66df02c49bde921 SHA-256: a94752f4e3c37bbacbee1fff172683b580b3fa33516b4bbc29ec7fbe0b191ba1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ggtraff.ru/strik?keyword=apprendre+alphabet+anglais+pdf. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to benign Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users seeking English alphabet learning materials.

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://ggtraff.ru/strik?keyword=apprendre+alphabet+anglais+pdf In PDF document text
    • http://jewaraso.d-aleksandar.com/uploads/1/3/1/8/131856072/7fe695da2346.pdfIn PDF document text
    • http://muwam.insightcounsellingtoronto.com/uploads/1/3/1/4/131437709/2148787.pdfIn PDF document text
    • http://files.thecheekyparlor.com/uploads/1/3/0/7/130776649/bukinirub-kezefuguxe.pdfIn PDF document text
    • http://files.yairlivnat.com/uploads/1/3/0/8/130813646/gelut.pdfIn PDF document text
    • http://files.scotlycan.com/uploads/1/3/0/7/130739802/8887529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/centrifugal_pump_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8071/4907/files/jefferson_bridge_association_charlottesville.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/hitman_absolution_contracts_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4488/6945/files/round_white_pill_an_627_side_effects.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2006/1342/files/charles_bukowski_post_office_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955d5bed-abec-4392-9a26-3a734ac8901e/ladejajosekonivisufak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b7e4ab-a9e7-4aac-b428-46dda167e767/96164104953.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8125/6098/files/mobafiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/66674049410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7840/0662/files/1_million_pennies_is_how_much.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5079/3110/files/tiwagelagolaxadukevid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1485/1240/files/persona_3_bebe_farewell.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEE 5432 bytes
SHA-256: 7bb5e641424d7b0a92bfc4d2af0446de0bb1ddf1a7e8cf8796755aa99074a828
font_01_sfnt_off00007258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 12788 bytes
SHA-256: 8a013150d8564caf9e746e10ba2fb94b78c5e9156175d70ad0c3a0522e5fa89f

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