Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d05ba6d09e9870…

MALICIOUS

PDF

46.7 KB Created: 2020-08-13 19:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eee42766f672c0f32fb29b5ebcbaf4cf SHA-1: fdbf4d8a391db0ebd03f54d6c75dffa91adee891 SHA-256: 51d05ba6d09e987004352377e4dfa207320c3190ac83d7fec74e00513223d80a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious content. No scripts were extracted, limiting the analysis of further stages.

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.ru/wb?keyword=rotate%20pdf%20and%20save%20adobe%20reader%20dc
    • http://bemajosaz.jeromesbistro.com/uploads/1/3/1/8/131871390/4031811.pdf
    • http://files.emkdgenealogy.com/uploads/1/3/1/4/131453250/4991405.pdf
    • http://files.thelafs.com/uploads/1/3/0/9/130969036/vofuzi_wewivo.pdf
    • http://xidize.sixwhitehorses.info/uploads/1/3/0/7/130740249/4ba27ea16.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/25579977181.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/45722879155.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8915/files/44640381412.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/completely_uninstall_mysql.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0681/files/metabolismo_anaerobico.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/39825705323.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6903/files/linux_shell_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/pelajaran_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0432/6647/4139/files/agriculture_in_thailand.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/tarascon_emergency_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/gaguzolexezepekoliwurupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/44799387496.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/difference_between_consumer_and_organizational_buying_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/abstract_algebra_an_introduction.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_off000077f0.bin
a9c107ed0d7a1ea7370a076f0cd013deca1fb6e61fc54a499eacbf047e4d31d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F0 5324 bytes
font_01_sfnt_off00008a1d.bin
c3190cf833b48afc1dec90c5c44f183dfcfb7218458dfc88b5d99d874cc36d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1D 10424 bytes

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