Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ba1331e4ac8851…

MALICIOUS

PDF

59.3 KB Created: 2020-08-17 05:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a5f84925df0d2a158e32e4ba32a678 SHA-1: 3c3e6d3063748bce530d1cb2d4ae4b9a77a58fee SHA-256: 75ba1331e4ac885127d48313942f28d826024581f9998514e1be3c0c342ed684
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO manipulation tactic to distribute malicious content or redirect users to harmful sites. The ML classifier also strongly indicated maliciousness.

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=android+one+moto+x4+vs+nexus+5x
    • http://juduku.lakelehmanmetz.com/uploads/1/3/1/3/131380005/0a775aee38200.pdf
    • http://files.audreyshopaz.com/uploads/1/3/0/7/130738859/rikutugolutu.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8806/0320/files/cash_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/mifuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/28047229225.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/incubus_master_pdf_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/64032176986.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/lotevope.pdf
    • https://cdn.shopify.com/s/files/1/0435/5365/2895/files/catarina_de_bragana_isabel_stilwell.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/fabusaxebuxug.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/barcode_reader_excel_spreadsheet.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000079dc.bin
ea9f984720dedb812022318f4d8aa6af7a9ff00287081bd5dc123c4cc2847ac6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x79DC 15608 bytes
font_00_sfnt_off00006924.bin
6b6fb0ff9bced15a5cc666464beb448d9d0f6602c47a538e0d93e601e77c6659
pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 4940 bytes
font_02_sfnt_off0000a49e.bin
29787d2b8fc1de4d7844b0441b291fd481a5b89e194a52108e0fe10e1f20ec6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA49E 14292 bytes
font_03_sfnt_off0000d211.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 4324 bytes