Malicious PDF — malware analysis report

Static analysis result for SHA-256 035e15985c5f9abc…

MALICIOUS

PDF

69.1 KB Created: 2020-07-30 05:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39507e62689b3c456e59886f11891e90 SHA-1: 34451518f1b73ebf53f4c5fe33c3abb40be063d5 SHA-256: 035e15985c5f9abc8a0fdbfdb219b4c6135bbafefd0ee6c020743c8d67321fdc
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 a link farm designed to distribute malicious content. One of the primary links redirects to a known malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=aparato+respiratorio+pdf+anatomia
    • http://files.buntcounselling.co.uk/uploads/1/3/2/6/132683289/lemew.pdf
    • http://files.beachcitiesrollerderby.com/uploads/1/3/2/6/132682040/giruroboje-raxilu-waxupujenini.pdf
    • http://files.teambethfoundation.org/uploads/1/3/1/4/131407823/sapuvifuzovaga-winigew-goradu.pdf
    • http://files.swimshsc.com/uploads/1/3/0/7/130739311/nivavolarivajozamag.pdf
    • http://files.dominicanhairalliance.com/uploads/1/3/0/9/130969545/pobax_fatavutizaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/99171159986.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/9977586088.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/37344431422.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/xomovuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/53007341053.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/zaxesaxubexofepawavazen.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/puvijawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/84058450683.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/fiwiketanabujumarulax.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/77017049355.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7939/files/40268070123.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_off0000d0c1.bin
cf817c4f4457ee71ec01b193eee280a646d64c149d96ad369ad80cd12e6f7e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 4932 bytes
font_01_sfnt_off0000e15d.bin
f0808a7234fe366888508bd562bf95bba583cc67888bdfe6dad75bf0f5c7a59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 11440 bytes

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