Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f661ba079ba7ef…

MALICIOUS

PDF

44.0 KB Created: 2020-08-14 10:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29f2c950cb7547dc8878ed9ba4f245b3 SHA-1: 1bd67834c3c3041e73adab87b2182a98de6db406 SHA-256: d3f661ba079ba7efb09a1b31d4143239e7f1ccead308a9a8cf0eefe8f2af72e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though malformed, contains a URL that appears to be part of this malicious infrastructure. The presence of a large number of external PDF links, many hosted on seemingly benign platforms like Shopify but pointing to unique filenames, suggests a link farm designed to improve search engine ranking for malicious content. 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/wb?keyword=production%20planning%20management%20pdf
    • http://bajikob.curiosityyogaandcoaching.com/uploads/1/3/0/8/130813372/rofinijivoxuxe.pdf
    • http://files.myfmpac.org/uploads/1/3/2/7/132710797/2764759.pdf
    • http://jisij.music-connect.net/uploads/1/3/1/4/131407233/mabilujibotoxup_visaremadoz.pdf
    • http://files.signorabarclay.com/uploads/1/3/0/7/130740166/5186877.pdf
    • http://files.centrestagedancestudios.com/uploads/1/3/1/4/131452949/a4e7f0764.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/clciker_heros_hack.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3142/files/korufumowiviwodoxux.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/lovepemopezix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/xenoradij.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/67576953131.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/49342841906.pdf
    • https://cdn.shopify.com/s/files/1/0431/3359/9893/files/giliz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/81150411044.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/92655425756.pdf
    • https://cdn.shopify.com/s/files/1/0432/4877/9426/files/tv_schedule_des_moines.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/bitsat_2020_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/english_to_urdu_oxford_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/25008475520.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/visolenusamiseso.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/
    • https://cdn.shopify.com/s/files/1/0431/8960/041

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f5e.bin
6f69a66d2b197486551ee19e1d903343d6c4974e9bbe7046bf7e831f81b09e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5E 5296 bytes
font_01_sfnt_off00008145.bin
94eb540d95f31555556f1e3a8737616f557409a8c835837451a225ccc997460e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8145 9876 bytes

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