Malicious PDF — malware analysis report

Static analysis result for SHA-256 41af06c62280231e…

MALICIOUS

PDF

54.3 KB Created: 2020-10-04 09:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50d4966c849af72f9e437a45cd66ed31 SHA-1: fbc984b30fdacc7c00adb98321da0f3151fd8aed SHA-256: 41af06c62280231e0fbf208f249ff527a64b0f1a6bcf1d6a1b8f63e790793b47
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'ttraff.club' domain. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/pify?keyword=college+basketball+shorts+cheap', suggesting a lure for potentially unwanted content. The presence of numerous external PDF links and the ML classifier flagging it as malicious strongly indicate a malicious intent, likely to drive traffic to malicious sites or potentially host further malware.

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://ttraff.club/pify?keyword=college+basketball+shorts+cheap In PDF document text
    • http://fawig.regionalpropertynsw.com/uploads/1/3/2/6/132682006/ladosopeda-redefevulupota.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/8821634250.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/mosikefesaj.pdfIn PDF document text
    • https://site-1040888.mozfiles.com/files/1040888/rarodo.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/gikipejamumikatin.pdfIn PDF document text
    • https://site-1039332.mozfiles.com/files/1039332/29907248399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e32517-e111-419a-bde2-29cc49c34d04/nuposerikukozilozugonurag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bc469d-1b20-4222-b223-f0fc56f9bee0/lajutowoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb0f03e-4195-4c6e-a9d0-ac4c1eb1440f/23822582373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d6a9c0-7333-43ee-b314-2519a9699f49/sorunorakegitivifidufagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516b9bfc-b7c0-4229-93e0-c417dbce8231/39222824669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4593/2184/files/jobetilupevizuwenixirafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/musemali.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D2 5304 bytes
SHA-256: 779264d7cdd3fa033bbda76a59e29bf9a57fe077eff90346f8abe7324bef8634
font_01_sfnt_off000089cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CC 1820 bytes
SHA-256: cfe7dcfa4a078a256f3971bef0c58835e76535ba0126e65f3bae9507ae2437e0
font_02_sfnt_off0000927e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927E 10332 bytes
SHA-256: 54f2df7821b9610ce5d9f5aeca87b357b78774137f9d70cef2b6e9dd1858dd73
font_03_sfnt_off0000b5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F3 16376 bytes
SHA-256: 069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c

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