Malicious PDF — malware analysis report

Static analysis result for SHA-256 8078850d5d47f3ec…

MALICIOUS

PDF

36.7 KB Created: 2020-08-03 05:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 805df5f1733e7d149c6141277a5cda4f SHA-1: 5b60944ed369f5938cca3e2d50252a53c65c2dbf SHA-256: 8078850d5d47f3ecefcf3f21c5a6f2b7cf0562ac22262bfd970f316e6c7c7b17
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 what appears to be a link farm designed to generate SEO traffic. One of the primary links redirects to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful sites.

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=3gp+mobile+movies+free+download+hollywood
    • http://files.dwfashions.org/uploads/1/3/0/9/130969389/1963457.pdf
    • http://files.bethuneandson.com/uploads/1/3/0/9/130969558/5578023.pdf
    • http://files.bridgendcastleplayers.org/uploads/1/3/0/7/130775228/wuxus.pdf
    • http://files.pugetsoundfarmtables.com/uploads/1/3/0/8/130814286/6846ffbbca23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9836/4321/files/game_boy_advance_roms.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/fugowejogovatijipirij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/26459342676.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/90994932643.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/57855193743.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2057/files/96544913544.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/57128796715.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/24933242239.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/gumixutemelisege.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/dimude.pdf
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/48640433959.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/58136061830.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/48830184252.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_off00005046.bin
740341d8dcdc357d226146a27c14be5cc9b9511dc5407916327fc04de3bb36f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5046 5920 bytes
font_01_sfnt_off00006453.bin
2b71beeeb3805200ec0feddded581fdd5edc92e05a03f69c89e95710d3dbd82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6453 9748 bytes

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