Malicious PDF — malware analysis report

Static analysis result for SHA-256 783a825b997cb8aa…

MALICIOUS

PDF

47.2 KB Created: 2020-08-10 08:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 081243635ed5d975fc3b1a5823f928bf SHA-1: 9ee95bcbc27bb2758504a0d4ee9f61103ce94f65 SHA-256: 783a825b997cb8aa50e6b09537959abc8d5ac5efd771af6090c8b92df7ce4e8a
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.com', indicating a phishing or malware distribution attempt. The document body, though malformed, contains text suggesting it is a 'hungry caterpillar worksheet pdf', a common lure for educational-themed phishing. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=hungry+caterpillar+worksheet+pdf
    • http://files.northstartheatercompany.com/uploads/1/3/1/6/131606186/wogixogapobufaz_ravuxone_jebuzemas.pdf
    • http://zuzejiwu.boneandjointdocs.com/uploads/1/3/0/7/130740013/putoxezox-pipowusolage-wupiwixizis-zobexe.pdf
    • http://files.acottagebythesea.net/uploads/1/3/1/4/131409709/wawegeresovixu.pdf
    • http://datutepob.haley-grace.com/uploads/1/3/1/4/131453177/7415661.pdf
    • http://files.jubileeaussies.net/uploads/1/3/2/6/132681865/78271c.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/ribezumiketuzej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/zogapajute.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/fogonunanugulanulabebipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/majusotogozarow.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/josolufesulekefobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/vasejebagetofolebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/a_arte_da_prudencia_baltasar_gracian.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/ranger_handbook_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/37287574534.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/la_vida_en_mexico_madame_calderon_de_labarca.pdf
    • https://cdn.shopify.com/s/files/1/0447/9988/5463/files/surface_area_and_volume_of_3d_shapes.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007872.bin
02c82eb3a37872544a9e7bca0a2e93145ff1c72ac220a14175091121ca73c44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7872 5636 bytes
font_01_sfnt_off00008bb4.bin
f82cd7e53ce3bb410d3bf45577c026003bb02aeccbfc7263abeac8c85387c12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB4 10472 bytes

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