Malicious PDF — malware analysis report

Static analysis result for SHA-256 05975991560bb555…

MALICIOUS

PDF

48.2 KB Created: 2020-08-24 00:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40953f7c3ed6754ba2cf528555ef8dcb SHA-1: 1b3c219235ef7c6b213b6db7e9070878d2d10225 SHA-256: 05975991560bb555424b17bdcadcd12e4548668f3ae10a8b0cc8c39d23d2d643
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external sites, indicating a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=corbettmaths+answers+changing+the+subject+advanced`. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of this redirection or link farm.

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=corbettmaths+answers+changing+the+subject+advanced
    • http://numifok.scopeinout.com/uploads/1/3/1/8/131856703/097422d50d9.pdf
    • http://degufa.undergroundprof.net/uploads/1/3/2/6/132681072/pevasozikab_supivipabifobiv_jujobafevolo_keloju.pdf
    • http://files.painpg.info/uploads/1/3/2/6/132682655/8772951.pdf
    • http://files.thelavenderpractice.com/uploads/1/3/1/0/131070458/d1e6e4ca7672e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/trophy_garden_platinum.pdf
    • https://cdn.shopify.com/s/files/1/0428/1552/0935/files/vuneb.pdf
    • https://cdn.shopify.com/s/files/1/0454/5708/0472/files/calotropis_procera_morphology.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/70424503210.pdf
    • https://cdn.shopify.com/s/files/1/0450/2067/6246/files/gagazawif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/jalomoluwetozewut.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/mastering_physics_pearson_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/dukofomesop.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/dupupelabunatuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/how_to_install_an_apk_on_bluestacks.pdf
    • https://cdn.shopify.com/s/files/1/0438/9486/6088/files/wepadelusuxez.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_off00007daa.bin
a0749327cbe0c4f8b51feeb704017ad108efc641ce44e6394f3b9458df54e033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAA 5592 bytes
font_01_sfnt_off0000909e.bin
cdf60cc7a1050692b032d478d804e835cf9175c706c167b4633777cf66ffb2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x909E 10240 bytes

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