Malicious PDF — malware analysis report

Static analysis result for SHA-256 61be0d7919b8ce93…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 06:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f416be0e62afa92d773add6d5174b47 SHA-1: a84be3551d9c8cac98ff58c4157fd02a71bb8882 SHA-256: 61be0d7919b8ce93946fbfba6ebb5f7234adc4bc7c5be42b2b8eda6f87613ad9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=to++games+free, is identified as a malicious redirector. The document body also contains this URL, suggesting it is the primary lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=to++games+free
    • http://files.conniecosbystewart.com/uploads/1/3/0/7/130775200/mesowegez.pdf
    • http://figexez.childrenspiazzapeabody.com/uploads/1/3/1/4/131453540/nasawoler.pdf
    • http://files.kdragonrecords.com/uploads/1/3/1/0/131070688/898fc5906.pdf
    • http://mosuvaru.thestampprofessor.com/uploads/1/3/1/6/131637240/4545802.pdf
    • http://files.mantorvilletheatrecompany.com/uploads/1/3/1/3/131381539/tajagobanijesiz_lozibuxupuxojun_giboxikowuwe_joravomejede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1642/1539/files/59242827870.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/19964272650.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamawogedeveredu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/53355003463.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/wajinanikumugenotegut.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5751/files/carlos_drummond_de_andrade_biografia.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/fivutowetanuniniragazapir.pdf
    • https://cdn.shopify.com/s/files/1/0448/8462/3527/files/collective_and_abstract_nouns_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7724/files/belajar_mengaji_anak2.pdf
    • https://cdn.shopify.com/s/files/1/0438/1428/9568/files/warhammer_40k_adeptus_mechanicus_codex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/bestiary_pathfinder_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/fatigolamoxejugib.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_off000068ad.bin
1e591bd8feb1082683aab8afa57ebc812fd8b9ecc2a7184de288b489c45b0500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 5004 bytes
font_01_sfnt_off000079a5.bin
d404072f94da6a833707cc36b50d011e5e7b16091926048a8029df4a4125f813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 10436 bytes

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