Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d24dc91332e3c2…

MALICIOUS

PDF

81.9 KB Created: 2020-08-10 19:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dcf7b63aa3711483b8b76e769419233 SHA-1: ca756966f4aad0d996003144f9e3ded8a73f8b18 SHA-256: 04d24dc91332e3c27ee1221019aca304e75ed1e2fa00bd66d8683655e466048c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=amazing+grace+hymn+lyrics+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting it's the intended destination. 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.cc/pify?keyword=amazing+grace+hymn+lyrics+pdf
    • http://files.pauldew.com/uploads/1/3/1/1/131164534/pulim-nibuderudiraba-pusulikedubikod-lenaperoxorasi.pdf
    • http://files.jford5000.com/uploads/1/3/1/3/131380054/d5b1bc4.pdf
    • http://lemup.pinnerplayers.com/uploads/1/3/0/7/130775403/tobuf_wefupuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/because_the_night_patti_smith_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/mezugatovuwapepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/35346514151.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/pdf_split_tool_portable.pdf
    • https://cdn.shopify.com/s/files/1/0448/0447/2992/files/bedingungsstze_franzsisch.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/nopekikejekuxefopavifas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6828/files/68759702856.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3620/3415/files/business_success_tips.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/nudenugujozusureluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/49134526394.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/futozokogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/83939140544.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/pipekotegezudu.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_off00010417.bin
27a608ee2820c6291c2312ed0c9738048b0437c004fdbca28ce2d86433d4b56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5708 bytes
font_01_sfnt_off00011758.bin
b775029f380302d83566774e556c0ed894074aa11c163d219d1b969c2d925fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 10192 bytes

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