Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f44efaf722cb7…

MALICIOUS

PDF

46.5 KB Created: 2020-08-12 02:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e90344cdbde2fab86248884fd76bbb7 SHA-1: a77c6bc5b0195b1eb69295c87f89832a1e495da2 SHA-256: 087f44efaf722cb75c5b675d417441bdfbf6439534ee02b2d83edecfd8225aee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely unreadable binary data, but the presence of URLs and the heuristics point to a malicious redirection scheme.

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=cause+and+effect+of+earthquake+pdf
    • http://ritusemes.brainaneurysmavmcommunity.com/uploads/1/3/0/7/130739017/fe509ab30bdf8.pdf
    • http://files.aandnlawn.com/uploads/1/3/0/7/130775475/4511354.pdf
    • http://jofetiju.alliesonthejourney.net/uploads/1/3/1/6/131607600/tonibusasuguj.pdf
    • http://files.suntzugames.com/uploads/1/3/0/9/130969545/3439fc90c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/caesalpinia_coriaria.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/kabeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/folobesarinubobulul.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/water_jet_machining_seminar_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/xivupevul.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/dikodoxokezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/98501617501.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/13248663649.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2332/files/zidiwitutenaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/20055242753.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/berlin_underground_map_english.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/xesezobevebevalokulogada.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0964/files/deforeri.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/lekuw.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_off00007624.bin
75e2d4bfc8307b073ecc19a4a9caa60b51bcd5e2eacff586315a146f0a61c9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 5304 bytes
font_01_sfnt_off00008823.bin
a936f4249cf0df267343462498f13819c0087865e70ced1fc876c51f65cc5639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8823 10740 bytes

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