Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea27f7c29dcde77f…

MALICIOUS

PDF

37.4 KB Created: 2020-08-02 06:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda036b4fde9d2f58c1e4dd1d36d72fe SHA-1: 19188f2e90119d3fa90ae30c7cdf1893358a8053 SHA-256: ea27f7c29dcde77f82af44f1097314ace4096d9b5c0fd57c72a6b1d38da81b25
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at https://ttraff.ru/pify?keyword=persona+3+fes+answers. The document body is heavily obfuscated but contains references to the redirector URL and appears to be a lure for "Persona 3 fes answers". The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of numerous PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=persona+3+fes+answers
    • http://files.drdonharris.com/uploads/1/3/1/4/131407047/rufufikediwosubofepo.pdf
    • http://files.soniamadelineevents.com.au/uploads/1/3/0/8/130814926/wolojujulaliw-dasikusegigaxa-furabadomobit-marajo.pdf
    • http://files.thebooksomm.com/uploads/1/3/0/7/130775825/satase.pdf
    • https://cdn.shopify.com/s/files/1/0438/4866/3200/files/kadomidituvubafojol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/44646807577.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/2368716242.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/52372034775.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/vagutajiwunadiguxusele.pdf
    • https://cdn.shopify.com/s/files/1/0439/6787/3182/files/john_deere_350_sickle_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/97142758362.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1543/files/gapebor.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0139/files/96369075339.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/nimodabejifupivak.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_off000054e9.bin
7039dd4a01bbe4af8317574587e0f02606dd5e5221df841a050c3dc11f3d15db
pdf-font-stream PDF embedded font (sfnt) at offset 0x54E9 4988 bytes
font_01_sfnt_off00006601.bin
0bc612e0115bfa1954633f790d5778c6a4370edb01a70ce467b16bb795dbfb9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6601 10228 bytes