Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e7ff3ba3839f41…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 09:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c0e0470913b63d80f72e4273eb8db8 SHA-1: cae2e35fbe9a68810b60cb01f4220a23cd505cdf SHA-256: 86e7ff3ba3839f41fcf3b30d8138f2526064e70370647492ccf30b48a8b3fcae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to academic resources and a URL that mirrors the malicious redirector. This suggests a phishing or scam attempt to direct users to malicious infrastructure under the guise of providing academic materials.

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=calculus+textbook+larson+9th+edition+pdf
    • http://files.caralarmandradio.com/uploads/1/3/2/8/132814977/8ca24203b89382.pdf
    • http://files.shandralamotte.com/uploads/1/3/1/8/131856584/ledido-gokidekadu-raduta-pusosugefis.pdf
    • http://files.treetopreptile.com/uploads/1/3/0/7/130775199/sirulokavaku.pdf
    • http://files.staywhole.net/uploads/1/3/0/8/130813710/7115585.pdf
    • http://files.whippoorwillfest.com/uploads/1/3/1/4/131438245/vixakivinarukage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/academic_year_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3354/2303/files/albert_camus_the_outsider.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/fetudim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/tatagezasosetikaborod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/39885492624.pdf
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/gumajufuvex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/bapavezab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/attention_getter_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/42562109529.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/11761830613.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/dewujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/www._prodigygame._come_play.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_off00005714.bin
f8c371c877c8c0ea7ef78ff8aa3db5d832dc09ba6e3710e3a994d82af0c39642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 5576 bytes
font_01_sfnt_off000069f1.bin
a4241a650326a9e312b55e8682d0bb87b39763a0a36e7f4e651716cdabdcec79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F1 13696 bytes
font_02_sfnt_off00009553.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9553 4324 bytes

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