Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc557074867320f0…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 22:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a15e10addbf47e75aac601075a057f SHA-1: 5c403d395234d617fec3b341b463c44c8a8e88c6 SHA-256: dc557074867320f064780007283753ea9b2bc7f4f00bad38ae91b9cc5a18201d
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, identified as a link farm. One of these links, 'https://ttraff.cc/pify?keyword=mercure+amelie+nothomb+pdf', is flagged as a malicious redirector. The presence of a large number of links, many pointing to Shopify domains, suggests an attempt to obscure the malicious destination and potentially leverage legitimate platforms for distribution. The ML classifier also strongly indicated 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/pify?keyword=mercure+amelie+nothomb+pdf
    • http://files.chicostate2037.com/uploads/1/3/1/4/131437941/ropaduguwe_tunugebugumez_jutob.pdf
    • http://files.meerakaulfoundation.com/uploads/1/3/1/4/131407823/41eff71.pdf
    • http://files.fightingsawks.com/uploads/1/3/0/8/130874575/1703944.pdf
    • http://files.chstage.net/uploads/1/3/2/6/132682723/5080405.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/69695016908.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/1596525419.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/nebuvegop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/shielded_metal_arc_welding_smaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/juleletutipelodowosovejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/4286537733.pdf
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/badomasopada.pdf
    • https://cdn.shopify.com/s/files/1/0435/5362/0136/files/74459287913.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97098861098.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/ctfd_urban_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/xuporiwis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/38148901590.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006699.bin
330acd3be150ddd3f842a1df4278af95b3ba81a422f650bfc031a7582653eb50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 5364 bytes
font_01_sfnt_off000078a9.bin
2f1695d54d5b98efe3eb58819ee47ad592961d878edd2a0b3c63f0ea7c904915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A9 10264 bytes

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