Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acedc7bb37c4d9e…

MALICIOUS

PDF

106.6 KB Created: 2020-08-06 07:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9f7a68f705d6717c781c5d387bbbb4 SHA-1: d45b4eb172350a0e0c7c75c1840cd68a0cdb52d5 SHA-256: 7acedc7bb37c4d9e5f6e80fc8b2774dba8dbc307df5355242e5cd4d2d622a537
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a known malicious redirector, suggesting an attempt to lure the user to a harmful site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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=exploring+american+history+pdf
    • http://files.generationjaguar.net/uploads/1/3/1/4/131406437/liguvelerefizo.pdf
    • http://files.alaskadalmatians.net/uploads/1/3/1/3/131380345/ac7ad976cd90.pdf
    • http://files.shorelinebass.com/uploads/1/3/0/7/130776445/595fbc36ba.pdf
    • http://files.anastasiasmitharts.com/uploads/1/3/2/6/132695574/e05a6fabae054.pdf
    • http://fulujoba.ramlcpa.com/uploads/1/3/1/4/131409200/9808736.pdf
    • https://cdn.shopify.com/s/files/1/0435/5027/7783/files/89735756620.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/napajakedodadamapizesuk.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/damodarastakam_lyrics_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/69196051457.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/salanokimumotiwis.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/854659895.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/27304309961.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/4350106571.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/kodi_17._3_ipa_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5572/7260/files/vibowuxatujewiwenobowixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/anime_ost_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2087/6962/files/lerotevanimirosake.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/livufanikawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/25315437007.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_off00014cef.bin
2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEF 2828 bytes
font_01_sfnt_off000156f8.bin
130c0ce02f9e8d9aeb76b316fb11f1578dd37315d828f5144bf2753218819e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156F8 5696 bytes
font_02_sfnt_off00016a41.bin
c3ae3cd6d23095a2316c53b414168eab235dfeed7f676b82ff1d7adf989c9283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A41 15664 bytes

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