Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff74c617d183056…

MALICIOUS

PDF

54.2 KB Created: 2020-08-18 14:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0899761ee57df6d9056eb69cbf1405f6 SHA-1: e3dc792734e2fa19e7123b5a8b69df361a7b8a86 SHA-256: 1ff74c617d183056e9d89b180f199a4fcc1538815c0df843cd37a116cbe2365c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The presence of a mass external PDF link farm further supports the malicious intent, likely to distribute malware or phish users through a chain of redirects.

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=consumers+report+used+car+buyers+guide
    • http://files.thecrowfromtheo.com/uploads/1/3/2/6/132695306/siwawaxoges.pdf
    • http://suviguma.vitalitry.com/uploads/1/3/1/4/131408738/ed651425517.pdf
    • http://ranos.drscottmonk.com/uploads/1/3/1/3/131398372/pavogewupepalepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/68309405404.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/gakiravi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/64351687575.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/berliner_platz_3_neu_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/codon_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6813/files/lalopexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/free_cover_letter_template_for_finance_manager.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/how_to_install_minecraft_forge.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/6044140433.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/america_settentrionale_riassunto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087b0.bin
a4a95168fc63d958f50e4a323520abbc7f543b2a70324b9acd83a623608098b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x87B0 5508 bytes
font_01_sfnt_off00009a4e.bin
4fc0e042beffddcd4388082bf55421e029a4a727d8abd964b3d8da92f7becaef
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 10292 bytes
font_02_sfnt_off0000bd8a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8A 4324 bytes