Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f049ab43a3cf82…

MALICIOUS

PDF

40.1 KB Created: 2020-08-09 15:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c58f82e31a3c09513843071f014b4d SHA-1: ddae88790f1f04c49c4db23d182011d56cf06d3c SHA-256: a9f049ab43a3cf826abf1086dff2d3a42a36966ac7398ddda49002729a7b0a66
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=addition+and+subtraction+for+grade+1+pdf`, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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=addition+and+subtraction+for+grade+1+pdf
    • http://files.individualsandsocieties.com/uploads/1/3/1/6/131606652/6063307.pdf
    • http://files.post111stl.com/uploads/1/3/2/8/132814048/ralijesagewog-wobelev-kisixidipu.pdf
    • http://warur.agendaforchildrenost.org/uploads/1/3/1/8/131871390/nawunixiv.pdf
    • http://files.twiggardens.com/uploads/1/3/1/1/131163533/dokelutawa_bajobuxarir_fusuzet_pinuzu.pdf
    • http://files.g-publica.com/uploads/1/3/1/4/131408204/47170148d7f7.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/26661778301.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/werirupiguzene.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/73910332264.pdf
    • https://cdn.shopify.com/s/files/1/0443/5791/0684/files/lusuvurazijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/lujiferenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/79594238000.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/75006907830.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/catholic_youth_bible_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/logical_reasoning_questions_and_answers_for_entrance_exam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/70140367097.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/sevaromodixorax.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/sixoremagibugux.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/75648790896.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_off00005d7c.bin
8fc5dcf9ea6e86baee4069af29d98da80b55915b8a83ce1270a2a7a657e2e26f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 5472 bytes
font_01_sfnt_off00007030.bin
77e9ffa14111a1c3a2a17ff801972d92d65ab8e197b415e40e2ab2086d12b1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 10284 bytes

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