Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ee415d6965f19d…

MALICIOUS

PDF

41.7 KB Created: 2020-07-08 13:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac878ed16bf04ee253868943fae8d504 SHA-1: e1cb7ad8995c2b8e4f8766a1be43fb0f7e8b964e SHA-256: 70ee415d6965f19d9252a71365fbb2e8f7bb8ac94e61bda76a523aff7dbea2e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to a known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. The document body, though partially corrupted, includes the title 'Divisibility rules worksheet for grade 5', which is likely a lure to disguise the 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/wb?keyword=divisibility%20rules%20worksheet%20for%20grade%205
    • http://files.parkcitypsychicmedium.com/uploads/1/3/1/3/131384101/direnojo.pdf
    • http://files.modga.net/uploads/1/3/2/6/132695361/dexemorogamebuw.pdf
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdf
    • http://files.supervillesovak.com/uploads/1/3/2/7/132710575/juxemi.pdf
    • http://files.michellexiao.net/uploads/1/3/1/6/131607346/xugex-xotosuzunixovir-kuvareduxifo-fufetatarifu.pdf
    • http://files.paskes.com/uploads/1/3/0/9/130969242/a42b2.pdf
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdf
    • http://files.narsa-us.com/uploads/1/3/2/6/132695574/wimazi_repotelonewa_rarowulow.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.richpmurphy.uk/uploads/1/3/1/3/131384573/6979155.pdf
    • http://files.russianasahobby.com/uploads/1/3/0/7/130776481/diwovetefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://korovite.files.wordpress.com/2020/06/mudimojijinaxijetad.pdf
    • https://jovumisev.files.wordpress.com/2020/07/dedotupab.pdf
    • https://puzedewufo.files.wordpress.com/2020/06/rigawepetibajetidezujetit.pdf
    • https://gigeseberi.files.wordpress.com/2020/06/nodazafijerukonaruf.pdf
    • https://xokoleno.files.wordpress.com/2020/07/62372443200.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_off000064e1.bin
921e4ca6d24684a06f2bc35db85b67308b5d1680e4bc8abffa2e19dd83568590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 5528 bytes
font_01_sfnt_off000077d8.bin
194f1a1fceee38627ff9ae88df399b74cfbb28842927f3a68964ba792086d359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D8 9964 bytes

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