Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ec3ac7426d847…

MALICIOUS

PDF

33.3 KB Created: 2020-08-07 20:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f2db9e302a17a3fbdab55c6bda9ae0 SHA-1: 7ee94f1e719c80517640cd1ad68418ac3cd0c1fc SHA-256: d88ec3ac7426d8470cbde4cc29a96709de36e99e476af51a7cb36533964e5b0a
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. This suggests the PDF is designed to funnel users to malicious infrastructure, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cardiovascular+physiology+david+mohrman+pdf
    • http://files.cruisingwithdonandglynda.com/uploads/1/3/2/6/132681579/titog-jobukini-silorabulotawod-lekiji.pdf
    • http://files.simonalexandercollier.com/uploads/1/3/2/7/132740905/pikosuko_wugozatif_gimedesu_nifepiduzi.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://files.antlerceilidh.com/uploads/1/3/0/8/130873923/masuwerol_kojokep_wixew_gibapikorakuga.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/warizotu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/riwiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/zawavodagexanupiberegodu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/donation_receipt_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/kupelexubefivivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/chemistry_of_materials.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/nixut.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/sijelopuvivigazarexa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/list_of_regular_past_tense_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/fufuninadakul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004674.bin
5e23597b92ccab4bed9f88f6b89b616c5c489699951cc854d3307f10e89f52d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4674 5636 bytes
font_01_sfnt_off00005987.bin
26bf6eb9f13fcd0d6a0adcd0fb3bfd916bcfd9a50cee0c274e8107edf945530a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5987 9072 bytes

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