Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f173f24a511f8f5…

MALICIOUS

PDF

45.7 KB Created: 2020-07-25 08:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c8aa027a2fd2f57d7003ebf3bcc3fa8 SHA-1: 52ddba3310180bf992339df0aee240836c8c8873 SHA-256: 6f173f24a511f8f50c0252d597b5fb7c5276b40bff2b4f75c9a1c7aa5d7ae0b9
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 known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'critical reasoning pdf for clat'. The presence of many external PDF links, some hosted on Shopify, indicates a link farm strategy. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded 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/wb?keyword=critical%20reasoning%20pdf%20for%20clat
    • http://files.gollychickens.com/uploads/1/3/2/6/132681307/rilegor-tedaruwos-fabavu.pdf
    • http://files.sidemocrats.com/uploads/1/3/1/4/131408117/rifefeposokaj.pdf
    • http://files.zuowenjie.net/uploads/1/3/2/3/132303163/ed091d.pdf
    • http://files.balletfolkloriconwi.com/uploads/1/3/1/8/131860125/kudalada.pdf
    • http://files.foryourhead.net/uploads/1/3/0/7/130739459/ziraragevalo_muzugevizovugor_turukazu_momirapug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/nowesosiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/67959356419.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/muralexeboxirijuga.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/nidusevilej.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/tuwosutune.pdf
    • https://cdn.shopify.com/s/files/1/0431/9313/9364/files/balonaxejegowomov.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/54784909222.pdf
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/nojorakad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/4683203084.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/nigemivib.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/31699498697.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/doragewotupepefe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.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_off000074dd.bin
be631cad3444d0af738f03272d5076320e30b63eac72952657d51903c1e09822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DD 5132 bytes
font_01_sfnt_off0000865d.bin
655061dac1530439ed32ea8e8f9e812b416efc4ced874ef72c3feae60521fddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 10492 bytes

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