Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2c77a8f4c90ee3…

MALICIOUS

PDF

43.9 KB Created: 2020-08-07 07:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1e3406ad9b2026724f2fbdedd6e864 SHA-1: 3079d0bcca6e1f1e0eaffe9551501d54dcbb4064 SHA-256: ef2c77a8f4c90ee387e24139736e05bf7b8504b46869f2209b80528df17b1660
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily corrupted, contains the URL 'https://ttraff.com/pify?keyword=mri+brain+atlas+and+text+pdf', which is flagged as a malicious redirector. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

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=mri+brain+atlas+and+text+pdf
    • http://petabef.intersoftsystems.com/uploads/1/3/1/6/131636612/f1b04618eb3.pdf
    • http://files.baptistegerbier.com/uploads/1/3/2/8/132814241/zikebudok-panoka-naludosazidefe.pdf
    • http://files.mischiefprojections.com/uploads/1/3/0/9/130969633/mafej-lufemofunugo-lufeb.pdf
    • http://bejum.cycledoctoralfactec.com/uploads/1/3/1/4/131438641/pumazuf_vovubokilatewor_lipopanaviweta.pdf
    • http://bojagugu.fdryan.com/uploads/1/3/1/0/131071164/942898.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/77713868781.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/pavanunoxiwemiborov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/86257916975.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/gazuwexakatulogutumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/27300268485.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/gibazaduwotixe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1150/4290/files/18299528915.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2959/files/dakurekogivozamimozix.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/wakegopilul.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/culinary_terms_a_z.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/wofisujaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5119/5299/files/nawogefilifolup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4885/files/31398964236.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e5.bin
996162542a893b91d25414469e186cf9ffeeb1fcd28c45bc3c70a3d12c9ef7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 5248 bytes
font_01_sfnt_off000075cd.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CD 1800 bytes
font_02_sfnt_off00007e5a.bin
3ede0480761c4f923d1f3b873c895c22c3d8383f182d5bbeb5ccf32c8775a056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 10564 bytes

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