Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ffa32653c34eb0…

MALICIOUS

PDF

46.7 KB Created: 2020-08-23 01:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f527dec83cd0e053a36167ffbdb660 SHA-1: e699650fa3439695fe566675c0bead5f3e16ad55 SHA-256: 76ffa32653c34eb09a58160d8a45dbd08c34999fedf3265c23aab6754809deea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=guided+reading+lesson+grade+4`. It also exhibits characteristics of a link farm, with numerous external PDF links. The document body, though partially corrupted, contains the same malicious URL, suggesting an attempt to trick users into clicking it. 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.com/pify?keyword=guided+reading+lesson+grade+4
    • http://xitoderar.cespremierpropertymanagement.com/uploads/1/3/2/7/132711947/likegokozo.pdf
    • http://files.sanziannaintegrativehealth.com/uploads/1/3/0/7/130775032/disekadojikivij.pdf
    • http://files.racarons.com/uploads/1/3/1/3/131383588/188d1cb4c5fd95c.pdf
    • http://pomidebe.banginhardfireworks.com/uploads/1/3/2/6/132681482/tumipepesinez-fivigut-tipunuripokoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/72592123892.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/cracking_the_coding_interview_github.pdf
    • https://cdn.shopify.com/s/files/1/0462/5183/5543/files/33840015037.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4154/files/78152368255.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/1_to_1000_numbers_in_english_words_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/45279703898.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/powerball_3_9_19.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/10709109362.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/jewez.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/vector_algebra_solved_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/mac_pip_command_not_found.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_off000077c9.bin
9f3e32a0bc6a206f49531b73a3920fa7f861e63c1e0e1bb994e0d9617cba3e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C9 5112 bytes
font_01_sfnt_off0000893e.bin
c037a9773a2ab7209dfe3757fbb0ea93101a86626b399baf2085f8f0a2cdb38a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893E 10784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.