Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac64b496224ca1f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 10:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de3eaf785826eda4d053c826a6fce6e0 SHA-1: fe4df729885de90d54eedb9d0fded02a1838878a SHA-256: 2ac64b496224ca1f709f76656069f84e3148b6f39317246d6b868f649af37bce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Quantity takeoff software pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of exploit or malicious content delivery.

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/wb?keyword=quantity%20takeoff%20software%20pdf
    • http://tikeb.laosyogaretreats.com/uploads/1/3/1/4/131407241/958654.pdf
    • http://files.michaeljaigrant.com/uploads/1/3/0/8/130874652/aa0ff74fe6b50e1.pdf
    • http://files.vislitsandbox.com/uploads/1/3/1/4/131437005/sotaxavud.pdf
    • http://files.serenitypools-fiberglass.com/uploads/1/3/1/4/131453543/2212876.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/fallout_4_pipboy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/cours_d_orthographe_ce1.pdf
    • https://cdn.shopify.com/s/files/1/0437/5281/6798/files/vigotefusisovegejotev.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/4469439213.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/53579493903.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/advantages_and_disadvantages_of_participative_leadership_style.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/conundrum_book_anuj_dhar_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/77673114532.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/josimafanipinarurekubumad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/76157060460.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2610/files/modibakonapomiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7729/4498/files/13239766467.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/pejatosubewizujamikejoli.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000667e.bin
76920e72e7a37c4cbd6999bfc515dfc0eee98c4c260607647a44119cbe1521c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 5320 bytes
font_01_sfnt_off000078c6.bin
1b7033149454a332b5cf51b8ef090e01cf760d49d3f63deb2b7703f13c0d1d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C6 9964 bytes

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