Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a2c99c64c0112e…

MALICIOUS

PDF

52.2 KB Created: 2020-08-30 13:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 945a3776e667bb66d23c5e0b7aafedce SHA-1: 3ef15b173b6789a91a72a2124d3a3ac446bc8a76 SHA-256: 68a2c99c64c0112e1b32d8426e28e65e7f59222b3448226e3548887207de2488
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to an 'episode guide' and the malicious URL. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicates maliciousness.

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/wix?keyword=oitnb+s6+episode+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/19332005861.pdf
    • https://cdn.shopify.com/s/files/1/0449/5812/2139/files/zimubufokoseboxazedamava.pdf
    • https://cdn.shopify.com/s/files/1/0438/7015/9016/files/bingo_card_blank.pdf
    • https://static.usrfiles.com/ugd/7603ae_607b2db9cd2c44ad9b873aed8b31381d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6165f694158d43ab92288a43d7f31baf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/52915951571.pdf
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/nozoxovadolakunede.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/kanda_bongo_man_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/situdufuzipezozugiful.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecf87b87e9d6415997fea48b7193cf8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f4c05d4cd9f4809ad1a8fb468ce694b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fd6.bin
369f07b22b310c15367ba447fe0db30f7bf579033c055f01dc4f2f8c717f5d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD6 5112 bytes
font_01_sfnt_off0000a136.bin
57ee8ec55ce8a06de9a4fc168ebeb30611a017f11894a3a9cc970f8d1cad1935
pdf-font-stream PDF embedded font (sfnt) at offset 0xA136 10372 bytes