Malicious PDF — malware analysis report

Static analysis result for SHA-256 acef831be0d8bf90…

MALICIOUS

PDF

47.5 KB Created: 2020-07-13 08:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4606cc65adf23c094829fd56417054 SHA-1: 113d25ed0c31d2bc641552dd43dd9d81dc40aaad SHA-256: acef831be0d8bf9060463ff291e41c5d92e73ef697574e9a93564092955448a8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The ML classifier strongly supports maliciousness. The primary attack pattern involves luring users to external sites via these links, which are likely used for phishing or malware delivery. The document body appears to be obfuscated or corrupted, preventing a more detailed analysis of its specific 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.ru/wb?keyword=golang%20concurrency%20patterns%20pdf
    • http://files.feliciasabartinelli.com/uploads/1/3/1/4/131406288/ditajijudole-sosex-febojeruzip-tewogaxad.pdf
    • http://files.ackertech.org/uploads/1/3/1/6/131607163/5082975.pdf
    • http://files.annabananaonline.com/uploads/1/3/0/7/130775979/5085359.pdf
    • http://files.refracted.net/uploads/1/3/1/8/131871648/8104995.pdf
    • http://files.susanhogework.com/uploads/1/3/1/1/131164211/pubajaxomukujexe.pdf
    • http://files.dfwaccp.org/uploads/1/3/1/4/131437029/menuzuloxatula_vofuvipavipe_fesudi.pdf
    • http://files.polktwp.com/uploads/1/3/2/3/132303312/sawixatif.pdf
    • http://files.alpsed.org/uploads/1/3/2/8/132815388/ledivusawete.pdf
    • http://files.alpsed.org/uploads/1/3/2/8/132815
    • https://zelugimipup.files.wordpress.com/2020/07/16776145914.pdf
    • https://zavivivive.files.wordpress.com/2020/07/49869308576.pdf
    • https://nofosepeji.files.wordpress.com/2020/06/banizopakiwekof.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/62776035618.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/tukafasewawekazexuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/gisulovojilusizewamejivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/wozujapotubikitenujuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96617946950.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/pugiwaxarosirotapanozoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/1916/5086/files/10982863924.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/memutonevizesofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/jumizipolajawefabodatuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60868594071.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c5e.bin
7c7624ac80dab76b0810f9f938ba5909a5b149cbd54ccd91a44c260bd8b2833a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5E 5292 bytes
font_01_sfnt_off00008e79.bin
1d16c996db63acff02ab8a5adcbb40157dcdcc6833cc3a49c5123ecc8b4d880c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E79 10004 bytes

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