Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0a08c217813e5d…

MALICIOUS

PDF

67.6 KB Created: 2020-08-19 16:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b2e6c87ef311ec347d7b698cae6217 SHA-1: 1584e59454ee87e50841a74db2fc853e51ee4a61 SHA-256: ef0a08c217813e5dc73b32ea93db67ab087475855b1ce49a5bbb22fc9836c5b2
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. A critical heuristic identifies one URL, 'https://ttraff.ru/pify?keyword=lagu+free+bird+versi+guitar+hero', as a redirector to known malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is driven by the embedded links.

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=lagu+free+bird+versi+guitar+hero
    • http://files.antonellapiccinigallery.com/uploads/1/3/2/7/132712306/topaludusawamixo.pdf
    • http://files.quasilocum.com/uploads/1/3/1/3/131380733/dazepip-tefifipipewesex.pdf
    • https://cdn.shopify.com/s/files/1/0435/6407/3128/files/fopepikiwitikaletulure.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/gobetujasufugep.pdf
    • https://cdn.shopify.com/s/files/1/0437/8073/5138/files/36888852962.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/echo_srm_225_gas_oil_mix.pdf
    • https://cdn.shopify.com/s/files/1/0440/5205/4181/files/vehicle_bill_of_sale_template_fillable_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/games_with_gold_september.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/wiwibanupogetasek.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/agentes_economicos_economia.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/11744326235.pdf
    • https://cdn.shopify.com/s/files/1/0435/9648/0671/files/angry_birds_space_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/36553477823.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/puwidisabalowagateke.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/15863427075.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac65.bin
1c072999d54f43cafef3e7d1a0aa416433b8c511e69b5befdc39ed40d0b20960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC65 5276 bytes
font_01_sfnt_off0000be58.bin
64d8c558470dab944a2b591e1bf054b6eabced30c7e872dd3f84626c65f59c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 13408 bytes
font_02_sfnt_off0000e9ba.bin
9324ab2abadecde96b323f341f311678d3ec68f72fc0a6a7f3a0f20e691f74ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16660 bytes

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