Malicious PDF — malware analysis report

Static analysis result for SHA-256 7413600422666324…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 13:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30fb243ac7b86268485f5e4e0ab2c459 SHA-1: 23482e9ce947a6578e7a98765e337415457678a6 SHA-256: 7413600422666324ffd9d6850a229beb0c2d660cc3f97767e58303c285ff20cb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of links to other PDFs, suggesting a link farm designed to obscure malicious activity. The ML classifier strongly flagged this PDF as malicious. The presence of a redirector URL points towards an attempt to lure users to 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.cc/wix?keyword=fique+rico+ou+morra+tentando+filme+c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/86625827130.pdf
    • https://cdn.shopify.com/s/files/1/0438/5583/9382/files/wetisefoxes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1880/files/tokeduwajalixakew.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/classes_in_c_example_program.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1077/files/miwogukabafifi.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd9af357b2694a81ad65a61be7d8105b.pdf
    • https://static.usrfiles.com/ugd/b8c837_98cd7f61adbf4dd3a33e90340b305af8.pdf
    • https://static.usrfiles.com/ugd/b8c837_92460ea311c6494fae54c155528fd7d6.pdf
    • https://static.usrfiles.com/ugd/f09a9d_db41951f0bd7477bbb46ea0c3eb708e2.pdf
    • https://static.usrfiles.com/ugd/80c1db_88c6eb9e89fa4e6eb0df353c178cfe26.pdf
    • https://static.usrfiles.com/ugd/b8c837_58779bafa566480795ba0f74cc2b1f02.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3ccff3355c4b72882e361250503326.pdf
    • https://static.usrfiles.com/ugd/d3758e_999cc21ca9924f279f2fdeae89f1965c.pdf
    • https://static.usrfiles.com/ugd/ddb60a_c126cf25edc84be29a8ebc10ac3cc9fb.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008938.bin
5525bd93796412320428a4eb2cd82aa105e5e926dad90cbe09592164669684c2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8938 18324 bytes
font_00_sfnt_off000050d3.bin
4e9443953603c9b4e02da24634ea1169e15e2fc9114c4040bebf5cad5cd45863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D3 5072 bytes
font_01_sfnt_off000061f9.bin
ca7d45e061dd24f8c7cbd0d30c39df1fbc27511d32a58bd5e10546ceef549ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 12476 bytes

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