Malicious PDF — malware analysis report

Static analysis result for SHA-256 700377c109928329…

MALICIOUS

PDF

44.7 KB Created: 2020-08-11 20:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99c7b0b3e96ebfb9f8a3551dc2fbd7e8 SHA-1: 83ada2ab5a7b132dd975cd4e055a783bec6222bb SHA-256: 700377c109928329e963417d58755ef180e1d47aca3b19976b0e8eaa7b4492c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as a link farm. One prominent URL, https://ttraff.ru/pify?keyword=auxiliary+verbs+and+modals+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=auxiliary+verbs+and+modals+pdf
    • http://fomabati.classoraclemedia.com/uploads/1/3/1/3/131383483/6528593.pdf
    • http://files.uttxts.org/uploads/1/3/0/7/130775126/nifefifogurar-nubov-wuvonor-rezogezalofuko.pdf
    • http://fifapedul.hot-chocolate-machine.com/uploads/1/3/2/7/132740623/89f94632352e88.pdf
    • http://movafi.byhyu.com/uploads/1/3/1/6/131636725/kupesiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/bodiwalatevanozejonot.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/yo_gotti_81_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/causes_of_diabetes_mellitus_type_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/20670564524.pdf
    • https://cdn.shopify.com/s/files/1/0429/4469/2383/files/school_management_and_administration_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/zakafakirera.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/47073257433.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/62335420910.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/administrao_por_objetivos_apo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.pdf
    • https://cdn.shopify.com/s/files/1/0438/3938/9856/files/smart_antenna_abstract.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/telecharger_dictionnaire_allemand_franais_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/31155075470.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_off000070f2.bin
fdb1f797a9bc82057bc71868bda182b9c36713b8ea3da75c38a5875e67ed9014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F2 5548 bytes
font_01_sfnt_off000083ba.bin
3a8a81f12392e855eb2a7788c189191bcc8598eefe208cddadf6a3260e66af81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BA 10180 bytes

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