Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9b8023ad3e3580…

MALICIOUS

PDF

37.8 KB Created: 2020-08-11 04:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff1531980a8cf3ebd7cd8175298b647 SHA-1: 8134d421397490d8a0aa5f9123dbb02b774e387f SHA-256: 0c9b8023ad3e35802bba064f08ef0bafeddb3340e59ec421c99942acac12064e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, suggesting an attempt to redirect users to malicious content.

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.com/pify?keyword=carson+dellosa+cd+4301+pdf
    • http://files.d-mtargets.com/uploads/1/3/1/3/131380308/luziteb.pdf
    • http://files.behealthyaz.org/uploads/1/3/0/9/130969190/banijaxupiwol-sovukilusa.pdf
    • http://files.pediatrictouch.com/uploads/1/3/1/4/131406505/lujoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/pifebivitor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/7_continents_of_the_world_and_their_countries.pdf
    • https://cdn.shopify.com/s/files/1/0446/0737/3476/files/coliformes_totales_nom_112_ssa1_1994.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/23334878617.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/76140187925.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/23660896718.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/topaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/ruwizatalerebarazof.pdf
    • https://cdn.shopify.com/s/files/1/0434/1465/1038/files/visezolejipurabumerip.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/texurisumotigef.pdf
    • https://cdn.shopify.com/s/files/1/0432/3442/7047/files/vubanoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/komewowemek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3623/7206/files/galijubu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ab.bin
c009e983bc12d131054a570f5c3afb94ce76c4e6d4d9da17b6f0042dc99f7c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48AB 5280 bytes
font_01_sfnt_off00005aa9.bin
00da8146b75ff2600f77d58b3fbc41223cdbca3ba30a0d5becf16c1e882617c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA9 9876 bytes
font_02_sfnt_off00007c71.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C71 4324 bytes

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