Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b5808c8c002169…

MALICIOUS

PDF

39.2 KB Created: 2020-08-17 01:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312fcf5c3bfd835e08a59d09bb94be37 SHA-1: ef634f6d65df05740a4ff43c100e46b49ceb02a0 SHA-256: 25b5808c8c0021695ee71712b0a46b756b608eabd56a70a8f9f6566dae0d6fd7
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm hosted on Shopify, with one specific URL leading to a known malicious redirector. The document body, though partially corrupted, contains text related to 'diphthongs worksheets grade 9' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=diphthongs+worksheets+grade+9
    • http://dofid.laurelwoodtroy.com/uploads/1/3/1/3/131398244/sovikukal_nuvofazib.pdf
    • http://files.simpleandsubversive.com/uploads/1/3/1/4/131407315/80ee89b.pdf
    • http://files.mzapatalaw.com/uploads/1/3/1/4/131437074/jugalofozovokaw.pdf
    • http://files.jasminewisephd.com/uploads/1/3/0/7/130775462/4780447.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/industrial_applications_of_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/bibla_ne_shqip.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/butterfly_valve_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/54744477762.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/besoxelifutazusimidax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/88974270771.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/zowawiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4843/files/29937154773.pdf
    • https://cdn.shopify.com/s/files/1/0436/1053/8147/files/sound_energy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0450/7946/2040/files/zureponu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/29792650285.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000509d.bin
c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509D 1696 bytes
font_01_sfnt_off000058c7.bin
a67a65fd4573653279d6254a56ef8736ea60079a83c9ee55ab5985d687c0ce4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C7 5500 bytes
font_02_sfnt_off00006b83.bin
dc028a4cba19aaa0507ff0b71dd12cfbd88e6a50c3bfade0bd9f5c7895b8f0cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B83 10648 bytes

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