Malicious PDF — malware analysis report

Static analysis result for SHA-256 6170d8f435efc7ae…

MALICIOUS

PDF

67.4 KB Created: 2020-08-20 08:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51b9f3f314ff7b91815804e2efb05249 SHA-1: 84a551bce2179c71d0791343d288cd36e85fd874 SHA-256: 6170d8f435efc7aef60458d5a7e35cffb21e867037abd5f9bfed4aebd8683e09
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes a URL that points to a redirector service, likely intended to lead the user to a malicious site. The presence of a large number of external PDF links, many hosted on seemingly unrelated domains, suggests a link farm or SEO poisoning tactic to distribute 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/pify?keyword=exercices+sur+les+accents+en+fran%25C3%25A7ais+pdf
    • http://files.blogoftheo.com/uploads/1/3/0/8/130874516/8104fe8fbd126.pdf
    • http://koxeku.mshsupwardbound.com/uploads/1/3/0/7/130739192/lijepebetoka.pdf
    • http://xexodopo.euccommunity.com/uploads/1/3/0/8/130814124/zixuruse_fizuketufa_sirixewasalubab_sivuwos.pdf
    • http://files.studiosisu.net/uploads/1/3/0/8/130813558/7451642.pdf
    • http://files.speakingofveganfood.com/uploads/1/3/0/7/130738836/89634825136cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/adverb_of_time_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/3936121532.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/5033124167.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/31728449884.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/rizexusuketawo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4126/5566/files/monoxubugilus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0433/8653/6092/files/carteles_de_la_guerra_civil_espaola.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080a4.bin
792e288023e4fbe73a0351c4e4cf94c19217598e688914c0413f09f13c1160d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 6568 bytes
font_01_sfnt_off000090f1.bin
bfd39562a671371b9d6134ae64d7f62d4a045a12467a916ca29928a5e4355d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F1 5356 bytes
font_02_sfnt_off0000a2ed.bin
acd063ec126415979fd026360316d8cf79962c6af7a937580fb2ad7c7401029f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2ED 7672 bytes
font_03_sfnt_off0000bc85.bin
9396327fec85542ad02c07c053e37f38572978954a0b41efa43c5de9633d3bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC85 12768 bytes
font_04_sfnt_off0000e45c.bin
915007072de49dd99d27a6f4bfb06d0f9ea18db855d3e673c648d288b011e006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16960 bytes

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