Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87795d5696ddbb8…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 16:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57bf7bcba5a64f27ca5814d3739f739 SHA-1: ea671dc416f892df05d046a0e2037eeec274cfbf SHA-256: d87795d5696ddbb8c6c0a313090f2d1b75cf6003bb06af71a679f9f1aa51478c
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for free printable worksheets, which is a common social engineering tactic. The PDF_SEO_LINK_FARM heuristic further indicates the presence of numerous external links, many of which point to potentially malicious or suspicious domains.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+printable+letter+d+worksheets+for+preschool
    • http://guzepit.watervillefederated.com/uploads/1/3/1/1/131164250/rokuvebifexutu.pdf
    • http://timotonib.datascienceeurope.com/uploads/1/3/0/7/130776349/e92dd25c74.pdf
    • http://files.geelongtriclub.com/uploads/1/3/1/3/131380641/nasujuve-jipizunesekiduz-munekax.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/waminuxefipovisuxobovuge.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/1163090287.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/mudra_bank_loan_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6578/files/chn_8_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/gafiwanaxag.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/esquizofrenia_paranoide_scielo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/24852790493.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/wesavunirez.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ed.bin
74c8cfb00a2542b0e91f6f1142cb6068c84b27f48c639c09bfa1b112cb4e518b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59ED 5284 bytes
font_01_sfnt_off00006bdc.bin
abf345477dcfb66a49eb523835d830665762feca41a978a10f618b51e9ed6783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDC 11604 bytes
font_02_sfnt_off00009164.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9164 4324 bytes

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