Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23a8e09784be334…

MALICIOUS

PDF

42.4 KB Created: 2020-08-28 15:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e8e1f5047407a993cf51c9dd3b6231 SHA-1: 9542b89d7571be678d365cda1a5dc041b5e245f2 SHA-256: b23a8e09784be334de22f167a908b629bc0f368c54a5f6cffa07c412beae0fac
152 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a malicious URL, disguised with text related to a 'john deere 4045' manual. This indicates a social engineering attempt to trick the user into visiting a potentially harmful site. 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=manual+de+parts+motor+john+deere+4045
    • http://makin.dmv911locksmith.com/uploads/1/3/0/7/130775734/5f64d9f0cf.pdf
    • http://files.batterseamirroremporium.co.uk/uploads/1/3/2/7/132741397/namudelunero.pdf
    • http://files.thewallssager.com/uploads/1/3/0/8/130874058/rojupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5104/files/sunafawaforenisiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/7289448911.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/sigojopezagipulixosapesab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/91486218108.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/scales_and_arpeggios_violin.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2346/files/95294264170.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/67081692772.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/irenaean_theodicy.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/renelataxebafufolazut.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/naxozezozatobudewuxonigod.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/ap_state_budget_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/accounting_transactions_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/15359503871.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/xanitezivigajiraporug.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_off00005790.bin
56937325beb99e76816224ecb7f84db8eecf81778cf237864137101632962903
pdf-font-stream PDF embedded font (sfnt) at offset 0x5790 5636 bytes
font_01_sfnt_off00006a97.bin
b4753bef4d7bec6e454b4475eb3d9c5273415021dc8b6bf1d82eaa0e70d9074c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A97 15400 bytes