Malicious PDF — malware analysis report

Static analysis result for SHA-256 f988728ceaf8cd8d…

MALICIOUS

PDF

52.3 KB Created: 2020-10-10 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 572627f07e2c2431f25b89a7612b35bb SHA-1: 563ac34fefba10c1829fe558f8e5ca266932d92a SHA-256: f988728ceaf8cd8d7f1fdd7f1e8473128bf432f807b3bb47fae651d4e8c1fff3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these links, suggesting an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=triple+play+car+seat%252Fstroller In PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/56541267970.pdfIn PDF document text
    • https://site-1036667.mozfiles.com/files/1036667/zobakaxexeretelet.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/tigixobusibarodebawav.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/julifonulafeb.pdfIn PDF document text
    • http://files.cameliascandles.net/uploads/1/3/1/3/131383982/f1910615ae3ac1.pdfIn PDF document text
    • http://zemepo.kyocreations.com/uploads/1/3/1/8/131856214/zudumazesagib.pdfIn PDF document text
    • http://vusesubi.ps177.com/uploads/1/3/2/3/132302978/8559176.pdfIn PDF document text
    • https://site-1038946.mozfiles.com/files/1038946/ziwisuwawewazaxe.pdfIn PDF document text
    • https://site-1048572.mozfiles.com/files/1048572/barop.pdfIn PDF document text
    • https://site-1039556.mozfiles.com/files/1039556/50758433239.pdfIn PDF document text
    • https://site-1043286.mozfiles.com/files/1043286/norigamat.pdfIn PDF document text
    • https://site-1043088.mozfiles.com/files/1043088/44040395087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/13263686041.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6831/2740/files/persona_4_sayoko_relationship.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6230/8247/files/civ_6_deity_tips_reddit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 4696 bytes
SHA-256: e41194d60bd59e48996c16250361291e6ddd8da3bbd222b5c91043e6487671ac
font_01_sfnt_off0000917c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917C 10604 bytes
SHA-256: 9bc01e0cbf87fd52b1a6235328be081b9254836597220cb4759091e72549a61f
font_02_sfnt_off0000b5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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