Malicious PDF — malware analysis report

Static analysis result for SHA-256 036a19fceb2b6072…

MALICIOUS

PDF

53.6 KB Created: 2020-07-30 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21df585ae36c4c7281b496b230e0a32 SHA-1: 369c1fa658f82faf6b17e05c51af696df0398a9f SHA-256: 036a19fceb2b6072ca2a0f45658e09b022a7f6a3484ceb1d4ab32114a31c7592
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 pointing to external PDFs, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'completing the square practice problems and answers pdf', suggesting a lure to disguise malicious intent. 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=completing+the+square+practice+problems+and+answers+pdf
    • http://files.lrxkinex.com/uploads/1/3/0/8/130814132/2049138.pdf
    • http://files.tprrest.com/uploads/1/3/0/9/130969429/xegiki-bofobazurabot.pdf
    • http://files.ahhs60.org/uploads/1/3/0/7/130739918/2170607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/24261666475.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/24053212874.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8723/files/94328527603.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/zunemuwujomemubudaseg.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/42029620157.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/47803914597.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/81613460829.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/4961403093.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/6962174298.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/notupofopoxapujidoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/pipoluluxesalakojinizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/82406121117.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/40406763311.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/55186198914.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_off0000912d.bin
feb31a415693a25e345ea446c230f4c0c46f1d92fc3270d27845c92f3f62047c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x912D 5832 bytes
font_01_sfnt_off0000a4e2.bin
018da976b568417a132acfc80c1a97f882742e8136cd7d7d5f4c642c7a9d9f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E2 10472 bytes

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