Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ad45bc33515823…

MALICIOUS

PDF

44.3 KB Created: 2020-08-22 22:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 472fe68e77cae7b2fe5f0e67bce1105a SHA-1: 95250a19ea0ea7bbfbaa092324642381f78d62d1 SHA-256: 02ad45bc33515823c7856d2956b077a8533d3750aeca8f9c6ea6a79568e86677
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially garbled, includes text related to 'Form 1120' and a URL that appears to be part of a link farm designed to attract traffic. The presence of multiple embedded PDF links, many hosted on Shopify, suggests an attempt to obscure the malicious destination and potentially leverage benign-looking domains 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.ru/pify?keyword=form+1120+nol+carryback+period
    • http://files.islamiccenteroftennessee.org/uploads/1/3/0/7/130775145/koroda-lujajumova.pdf
    • http://veruwajit.trinahoadleyphotography.com/uploads/1/3/0/7/130739775/gumojemewa_nobemedemim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/rikexozi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/rafisorisukojuxutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4877/9426/files/top_android_graphics_cards.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/24435193404.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/zamzar_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/refraction_and_reflection_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1948/files/aphorismen_zur_lebensweisheit_schopenhauer.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8903/files/global_tactical_asset_allocation.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/24824815286.pdf
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/banjo_kazooie_rom_hack.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/zadefi.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_off00006161.bin
3479f464a1dd421af19a08b84c10f4726dd3facdad6f3044b7ccebd23d806911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 5336 bytes
font_01_sfnt_off00007357.bin
a4e461129b7e44cc09d9b93a2b97966f54367b17b0155c7c883ea62605fda4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 10296 bytes
font_02_sfnt_off00009634.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9634 4324 bytes

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