Malicious PDF — malware analysis report

Static analysis result for SHA-256 44774505614c0672…

MALICIOUS

PDF

46.5 KB Created: 2020-10-26 16:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69206872785e5ae980438ca2c3f9adc9 SHA-1: bf9c2176305b5875748925dd045c132723eadd66 SHA-256: 44774505614c0672889bdbc1a47cbf9818603b8d02ae004c7af865ec1f1b4a3f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to harmful content, likely as part of a phishing or SEO spam campaign.

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.cc/123?keyword=jurassic+park+livro+pdf
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5f96c4ead3253.pdf
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8b14885ad04.pdf
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8e0eb8d9cab.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/vurarutuwadaja-gelareromepiv-vemofugugirafob-gidaxitijevido.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/wirigisozevu.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/ec5bf50.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/4994528.pdf
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/7018fcf1b65.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f8f9096cb999.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f912cebc479f.pdf
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f9693db9d6b9.pdf
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f919bd503d5d.pdf
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f8c73b8954b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gupuso/11792700420.pdf
    • https://s3.amazonaws.com/vidadaviwal/o_level_mathematics_revision_notes.pdf
    • https://s3.amazonaws.com/takateg/auma_valve_actuator.pdf
    • https://s3.amazonaws.com/jakujakula/plant_taxonomy_and_systematics_book.pdf
    • https://cdn.shopify.com/s/files/1/0462/7274/1525/files/9912613899.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/ffxiv_mining_guide_1-70.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_off0000765c.bin
440ba222a8b839559c0ccccacb6c32f51e2b2267cc86a8d7414e7ff2498f8820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765C 5264 bytes
font_01_sfnt_off00008855.bin
eaed0bec65d5f6433d62a84babb69f2db613eb74ef42452e5f367a3934997cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8855 10880 bytes

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