Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf665763fae4a842…

MALICIOUS

PDF

51.8 KB Created: 2020-08-23 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14c0f562184b2ebf636b1eb1b788ec0f SHA-1: 282677cb9b9a1437b1a918543f30602d074a822e SHA-256: bf665763fae4a842b57b12c95c462e84275b1251b1190d37b9ff8082f1439225
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a free template, aligning with phishing or malware distribution tactics. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links, some pointing to potentially benign Shopify URLs and others to unknown domains, suggests a link farm used for SEO poisoning or distributing further payloads.

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=free+felt+bow+template
    • http://kividul.baconandbears.com/uploads/1/3/2/6/132681352/26e4b7b72168d3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7432/2586/files/xedebapog.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/13931720523.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/9216530884.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8039/files/togumaleterozumitawuwezin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/17771752042.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/analysis_of_selection_sort_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/blood_type_o_diet_chart_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/ganinitor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/ruxufusotilugipevepudox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/sevesanolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/batteries_used_in_electric_cars.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f8c.bin
d90a32d34eecbe6ed3061246003bb59084c207427d2e1f673c1a0aee1ee74eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C 5056 bytes
font_01_sfnt_off000080b0.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B0 1800 bytes
font_02_sfnt_off0000893e.bin
5e5f3da8ccf39a0db8de853a55dd936ac863d4b72f87fff956c79b07b67ba30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893E 10288 bytes
font_03_sfnt_off0000aca7.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA7 16312 bytes

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