Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b1725b290d5618…

MALICIOUS

PDF

61.5 KB Created: 2020-08-14 21:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a08fce15fd5df9b3f6785331db714dbc SHA-1: 8c078cf45f76da0e44d93ed94f34f54408681b83 SHA-256: 79b1725b290d5618de696ffebbfa0b52606ed3677fbe1b2b6e27e38c66937f5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The document body, though partially obfuscated, includes text related to 'independent practice worksheet classical/ operant conditioning answers' and the malicious URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood 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=independent+practice+worksheet+classical%252F+operant+conditioning+answers
    • http://files.xavierlecouturiermusic.com/uploads/1/3/1/4/131406701/ea22f.pdf
    • http://zopenaj.jkntour.com/uploads/1/3/1/3/131383478/2234875d587.pdf
    • http://vadinox.farmworkerministry.org/uploads/1/3/1/4/131407440/bebaralilaroxukofij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/87108611806.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/muturokotogod.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/tebajuwij.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/gojugavibanozibiwoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/65681850629.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/fusofuremabax.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/wudabubumilorudedif.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/nys_form_nf-_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/9190/9025/files/mhw_torrential_sac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/26113758690.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/brick_bonding_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a861.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA861 2828 bytes
font_01_sfnt_off0000b25c.bin
1c363bee3e946836b7c0ac460742976cfb6997a77486e07774b0340e117d6da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 5464 bytes
font_02_sfnt_off0000c4fc.bin
1b15e2191da8164ab28d34205e26e8150296b6ddad27f27959552aa1c72bddf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 10256 bytes

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