Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7253fad71d2adb…

MALICIOUS

PDF

86.4 KB Created: 2020-08-13 15:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4813b51c1319b35dad7c958aab84fba2 SHA-1: f0fa8b681a6cdd25e95d9572765c7490d8c3184f SHA-256: 6e7253fad71d2adbf8266d772267ec179b0daaedec2ce91ddbccf7ce2af0207f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a title related to research, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing the user to a malicious site via the embedded link.

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.ru/pify?keyword=pananaliksik+tungkol+sa+asignaturang+filipino+pdf
    • http://files.eastcoastguitarexpo.com/uploads/1/3/0/7/130775413/be91df579ab7.pdf
    • http://bogun.rochecenter.org/uploads/1/3/1/3/131398455/xibipabuxeto_pudepidevuwa_siropozodevir.pdf
    • http://files.haptotherapiekoningsweg.nl/uploads/1/3/2/7/132740384/2520702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6100/8791/files/68138250257.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/tovivuxuwitasomefapobiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/24443178790.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/katokonefanilufaluzabuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzawubemamomavokam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/aktu_anti_ragging_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/vuzig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/morufufeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/john_deere_111_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/giwililubexujuzolidokif.pdf
    • https://cdn.shopify.com/s/files/1/0436/8610/1145/files/49459291513.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/firewood_shed_plans.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/dojiruxejomesanezag.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_off00011266.bin
37d3a595247695ea4a714320916a9f338b33c9fcab1c68c307c8ac882fc1f9af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 5272 bytes
font_01_sfnt_off00012460.bin
7b571881d06c9afe79e322265069a9fb56b4a9327a9c034db129a67b342f94cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 12092 bytes

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