Malicious PDF — malware analysis report

Static analysis result for SHA-256 b657f7e503cd22d0…

MALICIOUS

PDF

39.7 KB Created: 2020-08-14 11:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ed3f8e53ec7aa45746f2a906adde9f SHA-1: 2b843a23b16b9243af1d9bf26077c13e61137af2 SHA-256: b657f7e503cd22d0cba6424cf14106b4744b685437388b81b686daa4070cecbb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is `https://ttraff.cc/pify?keyword=jpg+to+black+and+white+pdf+converter`. The document body, though partially garbled, also contains this URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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=jpg+to+black+and+white+pdf+converter
    • http://files.mountaintopterriers.com/uploads/1/3/0/9/130968943/e8dc23a277e34a.pdf
    • http://zuwuvak.lorigphotography.net/uploads/1/3/0/8/130874043/jojekadisuw.pdf
    • http://files.jmechanix.com/uploads/1/3/2/3/132302993/bekudogekarin-jozebaveral-tuwotulevirive.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/sazazikevagok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/dofonedixuvidalavedanigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/64741557223.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/inside_reporting_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2375/files/71094199857.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/veterinary_biochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/45414405890.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/zedisenigaxixofidobopunup.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/roridunexuwixumipubixego.pdf
    • https://cdn.shopify.com/s/files/1/0431/0243/7527/files/98285866514.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_off00005cef.bin
099a1a730e68b75140426f9f13edf8958497be1d71fc113665ad7c30101f4da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEF 5584 bytes
font_01_sfnt_off00006ff9.bin
bfec6d830130d0b66726bfcc17a392d5aa27531a97a1d0c75e6c6366ab38a09e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 10004 bytes