Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aabbe515458d7b4…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 17:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bed252c17b2df61a0054d344069903f SHA-1: 3aa50821b0d0b8c7b4ac4a4840ff8a7be25f0cbb SHA-256: 0aabbe515458d7b410aa8b8fbe93924986b603942dbdbb7c68079945d978e9b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), and the ML classifier strongly flagged the document as malicious. The document body, though partially corrupted, contains text related to 'teaching for young learners pdf' and references wkhtmltopdf, indicating it's likely a lure to drive traffic to malicious sites.

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=teaching+for+young+learners+pdf
    • http://files.transportchicago.org/uploads/1/3/2/6/132681456/d7cd05370.pdf
    • http://files.kookiekooks.com/uploads/1/3/1/3/131383775/715835.pdf
    • http://files.eccentrichearts.com/uploads/1/3/2/6/132681351/zijonis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/alternator_diagram_wiring.pdf
    • https://cdn.shopify.com/s/files/1/0440/7328/7830/files/memisokizelexawiviwedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/48766752778.pdf
    • https://cdn.shopify.com/s/files/1/0432/1070/3010/files/tnt_minecraft_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/35139877073.pdf
    • https://cdn.shopify.com/s/files/1/0435/2802/8312/files/fuxobudonikizokiraparil.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1029/files/global_business_environments_and_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/56158635144.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/dixoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/raxezevumedujejerixisem.pdf
    • https://cdn.shopify.com/s/files/1/0438/7943/2347/files/nenun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/beginners_german_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/26624928511.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/5497988212.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006161.bin
eed23402e012fbb9947c0a8c6e4ca5775df797ce854e159438b175b77c8577bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 5468 bytes
font_01_sfnt_off000073fc.bin
ab4eb4fabcb41a9ec60f6f5399959019296ed7e1de7424438d69164cbdacb0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 9956 bytes

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