Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4995414d9fd650…

MALICIOUS

PDF

41.7 KB Created: 2020-08-14 04:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3833e8e75dc8cda7606af64f3ba477ec SHA-1: dc2c9fd3b827f23a4d46c2b88b7bb852a76d03d9 SHA-256: 8b4995414d9fd650e4d4b2caf210d63bad53afc49bd1a29d437c489c6abb91cf
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=transgenicos%20pdf%20greenpeace'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this is a critical finding. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier strongly supports the malicious verdict.

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=transgenicos%20pdf%20greenpeace
    • http://koluzi.frogpigpug.com/uploads/1/3/1/3/131380160/jibeworopos_kepomogexipet_wufuzajukipum_zigewo.pdf
    • http://files.kristinayee.com/uploads/1/3/0/8/130873943/fb7ff06a270927.pdf
    • http://rifena.shamanjessica.com/uploads/1/3/0/9/130969352/2243366.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/57154765393.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/mean_median_mode_grouped_data_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/43871492654.pdf
    • https://cdn.shopify.com/s/files/1/0435/1482/2808/files/list_of_2012_comedy_films.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/physics_syllabus_for_bsc_1st_year.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/wesuginudilerujegevikex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/41849411974.pdf
    • https://cdn.shopify.com/s/files/1/0429/5245/8396/files/fast_bowling_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/champions_return_to_arms.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/socio_demographic_factors.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/52904198066.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6383/files/aiag_ppap_manual_download.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_off000064e5.bin
bd494109477e337647fa2054c8454f1340b3f6cc9df65cb83a7aedd99d540049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 5240 bytes
font_01_sfnt_off000076b7.bin
61fa2a15691d7702afd70dc65a86afe689840c9e642c39af541bffa4846f6bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B7 10888 bytes

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