Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d3192af0824594…

MALICIOUS

PDF

43.5 KB Created: 2020-08-18 19:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 114d137e777a0106a715255784d4bf03 SHA-1: be0143d43527b0a4993ca919860b3c0107930dc1 SHA-256: 61d3192af08245941b64fc1f58a0fc6ea87acd9bbe5bce92f350d1d9fef9a41e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1505.003 Server Software T1071.001 Web Protocols

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document also contains an instruction to disable security software, which is a high-risk indicator. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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=autocad++for+pc+2019
    • http://jijov.grizzletech.net/uploads/1/3/0/8/130874254/maxunafaw-variwi-ligolixoxisusar.pdf
    • http://files.artsmedicineforhopeandhealing.com/uploads/1/3/0/7/130776200/8787088.pdf
    • http://files.musicinmclean.org/uploads/1/3/0/7/130739037/vibepizilana.pdf
    • http://files.cavespringhsband.com/uploads/1/3/0/7/130775539/744881.pdf
    • http://files.wcsuticklab.com/uploads/1/3/1/4/131437676/vawozekudum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/77115202704.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4162/files/6th_grade_math_printable_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/8846/8376/files/nabemikor.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/tirofafivupev.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/bosemeli.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/27560161012.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/benim_hocam_maliye_video_ders_notlar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/jafikoriwazugipotofimi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/countable_and_uncountable_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0438/3241/0272/files/vebaratuxunudelel.pdf
    • https://cdn.shopify.com/s/files/1/0434/3096/9511/files/5223660947.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_off00006bef.bin
4b5f5b2da8bc953104ae29c29198590bbc7c8eabc983095ee984289d79dd512e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 5412 bytes
font_01_sfnt_off00007e64.bin
6db7a6bb318a47bf50d4f01171f18ee4ef469777a7ec1aecca521051b4c0efeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E64 10160 bytes

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