Malicious PDF — malware analysis report

Static analysis result for SHA-256 700821f430d18c27…

MALICIOUS

PDF

52.5 KB Created: 2020-08-19 05:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e8ef49f4d8f34058691bc81513cc47a SHA-1: 70d6ed3085b022b8b2b8071656cd10ac0620f6a8 SHA-256: 700821f430d18c27e7c4c2cfc1b90eb135d58756c8547879b339ff3910ac202f
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a resource for system administrator interview questions, but analysis reveals it points to malicious redirector infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to obscure the malicious destination. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful 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.com/pify?keyword=system+administrator+interview+questions+and+answers+linux
    • http://files.metropolitancme.org/uploads/1/3/1/4/131453350/nesugivexik.pdf
    • http://wutar.nubim.net/uploads/1/3/1/8/131856145/getolarusimub.pdf
    • http://sasotokib.allstarsandbestsellers.info/uploads/1/3/0/7/130776257/2421813.pdf
    • http://files.bakercityharvest.org/uploads/1/3/0/8/130815137/e287f560e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/pdf_to_audio_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/joomla_e-_commerce_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/55219522296.pdf
    • https://cdn.shopify.com/s/files/1/0438/8959/0427/files/liberation_rosary.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38692385895.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/50687395157.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/45705792470.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/loxejebidiwoniv.pdf
    • https://cdn.shopify.com/s/files/1/0453/9875/3448/files/8586291050.pdf
    • https://cdn.shopify.com/s/files/1/0433/4223/3755/files/cause_and_effect_activities.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/85680106685.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/31982417840.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_off000087be.bin
0234b27857a8440643e6868e1062dd287191830c0dc8bd3c3f8b7b4c8f00ffe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BE 5520 bytes
font_01_sfnt_off00009a81.bin
3c04756f650edc966042bcb420599ad7076e9f8853ab9400aa71058bd00a5162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 13488 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.