Malicious PDF — malware analysis report

Static analysis result for SHA-256 65887afca3a798fc…

MALICIOUS

PDF

40.1 KB Created: 2020-08-08 05:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 718c7de6df8559ed9c6fc38995aa57f3 SHA-1: ea5743168df1251b57de34de30cce64238c93a29 SHA-256: 65887afca3a798fc5620de2c4c5be9d11f4cba89a2097656f5f23bf48a936e80
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. While no scripts were directly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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.com/pify?keyword=12a+cartridge+refilling+pdf
    • http://falaregom.theflightproject.org/uploads/1/3/1/6/131606069/zevuzifekilifuv_janogeme.pdf
    • http://torif.professionalbowhunters.org/uploads/1/3/0/7/130775997/magijezofo.pdf
    • http://files.sewtruestudio.com/uploads/1/3/2/6/132680931/nufurudifuti_taregutolomem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/rosetta_stone_v3_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/jelunafedafozuvolebozagor.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/calzedonia_katalog_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/gitosipawugutiwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/esl_154_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/xebezogafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/45096348294.pdf
    • https://cdn.shopify.com/s/files/1/0436/6876/6873/files/90124334718.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/36720459032.pdf
    • https://cdn.shopify.com/s/files/1/0431/6220/6357/files/analogy_literary_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/zorapeboboma.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/nudata.pdf
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/obito_fetal_definicion.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_off000060b9.bin
59c66d43795ed075c897dcda9300ede526f0c43bf3761c8ba9cd8261b5467c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B9 5232 bytes
font_01_sfnt_off0000729d.bin
793f3eba8e31445e246ccb4c25822fc9217b3452253ea821b73dab525e58ca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729D 9736 bytes

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