Malicious PDF — malware analysis report

Static analysis result for SHA-256 04743374cd5a2b8c…

MALICIOUS

PDF

74.0 KB Created: 2020-07-28 17:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d3690b31dd461e9eb5021fcb1797fb2 SHA-1: 9b20c144f584ce27a908c17e2745aba04de5f698 SHA-256: 04743374cd5a2b8c7dcffb0ac4207a820dbd6bcf9e26d9a4379ce5ae425ff589
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

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=cool+bios+for+instagram
    • http://files.clemmonspresbyterian.org/uploads/1/3/1/3/131381900/1330131.pdf
    • http://files.carolenapier.com/uploads/1/3/1/4/131413718/a5a06.pdf
    • http://files.twcnpc.com/uploads/1/3/0/7/130775490/dikutomif_gasin_fudekujafijuf.pdf
    • http://files.studio519.net/uploads/1/3/1/4/131406885/mepepevemiban_ponoxetoralove_xewunos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/28669396322.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/novokufimetupopesewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/filebedajonazazemozeda.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/sezawomibel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/gobafovetuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/93387945244.pdf
    • https://cdn.shopify.com/s/files/1/0434/0524/6631/files/39320215518.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/96744206258.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/68906349803.pdf
    • https://cdn.shopify.com/s/files/1/0436/5346/4214/files/15197734028.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/xovonimefafawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/zijuwabuwezapupeniguxazi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a003.bin
cfac6772d40d2ca504ba1a02a94de3deaf852eb897df42cc29a9b1be5a2adb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA003 4920 bytes
font_01_sfnt_off0000b090.bin
24d24c21d44cd019884c2568dfed39df52a10f436f812e7b66952952514f18aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 13780 bytes
font_02_sfnt_off0000daa6.bin
79049ecd9684f2f73cab63f7f1ebe8cafd09c06a5847c3ff63eaabeb315b25b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 10884 bytes
font_03_sfnt_off00010004.bin
7c4d63be7423b8f9de0cb510c284379b9cc41590eb8b78702d6d07e76c2547a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 17812 bytes

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