Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b73a41e8f5f5ff0…

MALICIOUS

PDF

43.1 KB Created: 2020-08-22 03:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53fbb191011d3e6c6c2843cca9af473 SHA-1: b0978186c89aa685b21b982d520616f7c6b47d20 SHA-256: 1b73a41e8f5f5ff047a563667729f9cdd6cbbf6adea7530063d33e201e7fb8aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to wedding invitations and the URL https://ttraff.ru/pify?keyword=kerala+christian+wedding+invitation+card+templates, suggesting a lure. The presence of a large number of external PDF links also points towards a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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=kerala+christian+wedding+invitation+card+templates
    • http://zizexefig.phillipsbanini.org/uploads/1/3/1/0/131070450/492601.pdf
    • http://wefavon.strolltotown.com/uploads/1/3/0/8/130814238/kisabex.pdf
    • http://jikan.blancacabreravera.com/uploads/1/3/2/7/132741031/sevidazabegugaf_mipexiweb_jojowi_bavokulo.pdf
    • http://gasixevas.ariosostudio.com/uploads/1/3/1/4/131453134/5c81eac28e1a7c.pdf
    • http://files.downsideupphoto.com/uploads/1/3/1/4/131407178/3524040.pdf
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/xajukedupor.pdf
    • https://cdn.shopify.com/s/files/1/0453/2230/5691/files/biography_of_rabindranath_tagore_in_bengali_language.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/analise_sinttica_e_morfologica.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/detusu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1096/files/rowofikorokatox.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/agnisakshi_serial_yesterday_episode_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/vumak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/44999451451.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9434/files/22236029258.pdf
    • https://cdn.shopify.com/s/files/1/0444/0604/6886/files/text_2_speech.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_off000069fb.bin
17d91d2c8b6009f3977eb187b5da4c942db61dd43c6bb7579d937cda25914641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 5608 bytes
font_01_sfnt_off00007cf9.bin
a8597272842d0dd3a877ef36fef08a84efd3e5e1f0b78bd59439d9101902df54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF9 9988 bytes

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