Malicious PDF — malware analysis report

Static analysis result for SHA-256 715bb904a19a22a7…

MALICIOUS

PDF

72.4 KB Created: 2020-08-12 00:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 934a1e0c1cb31110a955ea785e6909d9 SHA-1: 97e628d3d75c990772090067ed45542a8ef411ba SHA-256: 715bb904a19a22a7ac2728cbf49cf74b2c5bab9bcc5564c128c142d4f331bebc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to "voltage divider example problems pdf" and the authoring application, suggesting a lure to disguise malicious intent. The presence of a large number of external PDF links, many pointing to benign Shopify domains but some to unknown or potentially malicious hosts, indicates a link farm or redirection scheme designed to obscure the ultimate destination.

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=voltage+divider+example+problems+pdf
    • http://files.sallysweetland.com/uploads/1/3/1/4/131438249/e377953a8cde1ef.pdf
    • http://gopimox.holywellwalkersarewelcome.org/uploads/1/3/1/3/131380213/jowazal-dojafozeriw-bitok.pdf
    • http://sonurida.floraskivington.com/uploads/1/3/0/7/130738714/a0c22be39f798fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/68841738392.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/4005054265.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/tusofawakusubupereboref.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/33690406468.pdf
    • https://cdn.shopify.com/s/files/1/0429/4482/3452/files/types_of_buying_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/xozapunefemaxevadukuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/tafilalezitozogowire.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/94213655039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6018/files/47566522437.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/busifafelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1057/9865/files/73449335042.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce62.bin
28da84d9e75294fbcff3052881d231ed2295ad97e04836ef2ccacbf9e9fc4087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 5276 bytes
font_01_sfnt_off0000e053.bin
a8afc6d5126e4673cf965b6f63ae4d86f4bec9b87d1b4812d1eaaf9b3959042b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 11544 bytes
font_02_sfnt_off00010614.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 4324 bytes

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