Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce4b42ddea03354…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 09:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a692c09d8c5832f45166f101a5a5f3 SHA-1: ab83e50d2cd171aaefdf3073b91eb960d119611c SHA-256: 3ce4b42ddea033548f49650876226e2196cea9dea4fae481065111fd22437914
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a lure for a 'construction cost estimation book pdf'. The primary malicious URL is https://ttraff.ru/pify?keyword=construction+cost+estimation+book+pdf, which likely serves as a gateway to further malicious content. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=construction+cost+estimation+book+pdf
    • http://files.shamblinstone.com/uploads/1/3/1/0/131070688/baxumikonozo_bikisuz_dawegedo_gatokezisanape.pdf
    • http://files.vegasbhs.com/uploads/1/3/1/0/131070080/52649c8ca3c1.pdf
    • http://jikerefor.chtechlab.com/uploads/1/3/1/3/131379732/kudasufit-jugapovitudit-maduda-wodupuvibawon.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/dekapawuke.pdf
    • https://cdn.shopify.com/s/files/1/0439/7082/2302/files/what_are_human_values.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/67607079234.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/calendrier_2020_excel_et_pdf__tlcharger_gratuitement.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/55239985331.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/78055247728.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0434/2248/2582/files/rusibub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/544194168.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/borana_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/xujotoworugoze.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_off00007a31.bin
783946e63ff757bdefd2a1457585ad80072fd04d6eca361ff85340593b732c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 5376 bytes
font_01_sfnt_off00008c5c.bin
3ed51f7906dc3a45c24758decf4f7c62322280d8a81a2284e483e86c305317ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 10524 bytes

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