Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bed006a7cbdc67…

MALICIOUS

PDF

47.8 KB Created: 2020-08-09 00:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edcc7294738a1c6d2d18e0b5b13662fb SHA-1: e006c9e9b32823aa10cf383c5447b588171b75f7 SHA-256: 33bed006a7cbdc671b99421969f645b5a59eda0f6a3ae0efe0e67f6ec331012c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, specifically 'https://ttraff.com/pify?keyword=economistas+clasicos+y+sus+aportes+pdf'. This indicates the document's primary purpose is to redirect users to malicious content. The presence of a large number of embedded external PDF links further supports the SEO-based link farm tactic, likely to improve search engine ranking for malicious sites. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

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.com/pify?keyword=economistas+clasicos+y+sus+aportes+pdf
    • http://files.marchmontfarm.com/uploads/1/3/0/8/130874276/c99e231fe97.pdf
    • http://files.kafyeblaan.com/uploads/1/3/1/8/131856381/becb5.pdf
    • http://files.wordsoundguide.com/uploads/1/3/0/7/130776809/rutifinuzepewe-juwogofo.pdf
    • http://files.crossroadschurchvt.org/uploads/1/3/1/3/131379591/vakaxazote.pdf
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/77375350396.pdf
    • https://cdn.shopify.com/s/files/1/0429/2493/3287/files/dotalaxar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/nissan_720_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/coordinate_geometry_by_abhinay_sharma.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/kagasoziti.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/90446980091.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/64209793369.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/timilebuzi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/wotawima.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/almanach_zahad.pdf
    • https://cdn.shopify.com/s/files/1/0438/3847/2357/files/masm_assembler_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/59697489049.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/vofigofawavepipuzejogup.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/96596889235.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/1/0434/8890/3325/files/kagasoziti

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d55.bin
9dedaf72a6db2cd4a8b2b3eeb9116c857d63d7afbc5c5f81afe3d1a6ec36f03e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 5360 bytes
font_01_sfnt_off00008f88.bin
a1e6d608253dd71388f92ce7847ac3d48b3882f778557a553b309f88d5758a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F88 10528 bytes

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