Malicious PDF — malware analysis report

Static analysis result for SHA-256 df452f1379beefec…

MALICIOUS

PDF

42.1 KB Created: 2020-08-25 12:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30f32c57149e5b1d827f24e8e7bb1533 SHA-1: fb1b505ed3d349f7bdb91ce24901c32e88eead30 SHA-256: df452f1379beefec4c2772f10a1677307280af2e01c1eb2b9635cd47f5d426da
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to interview questions and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO manipulation or to distribute malicious content. No scripts were extracted from this sample.

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/pify?keyword=school+assistant+principal+interview+questions+and+answers
    • http://pukovag.thegasrepublic.com/uploads/1/3/1/4/131454035/5cf162b6831ce7.pdf
    • http://tifed.loganbrady2019.com/uploads/1/3/2/7/132740214/ruragixujuxaz.pdf
    • http://vedixuv.dennispatrickwoodphd.com/uploads/1/3/2/7/132710773/zokikesifegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/24205588489.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/82597875710.pdf
    • https://cdn.shopify.com/s/files/1/0439/3218/8840/files/39621670177.pdf
    • https://cdn.shopify.com/s/files/1/0449/8879/2990/files/bonus_act_nepal.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/cambridge_igcse_economics_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/kuzij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5842/files/zoxopulutovolemimur.pdf
    • https://cdn.shopify.com/s/files/1/0435/3081/3589/files/lifelolonevubigefura.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/pijulafuvaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/verotakemofosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2769/files/dijorovuwugasimanetotap.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_off00006747.bin
20a495f47aecd801af522feb9193f8b6ff7b3249ac6844a78f8110f3ca256768
pdf-font-stream PDF embedded font (sfnt) at offset 0x6747 5540 bytes
font_01_sfnt_off00007a17.bin
74286d3f45040c61bf3ef36c0c3cce0cafbe303de79de1d49ec70d6e0b3179c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A17 9572 bytes