Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba84f0060c12a399…

MALICIOUS

PDF

48.6 KB Created: 2020-08-31 09:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3bd68e245ea55b3b113cd4c51c2184 SHA-1: 0276fc137adb2e46c492f47dd248f415054446d1 SHA-256: ba84f0060c12a39935c9edd4a0fb69fc64f8920084dde9f9a87211e4a6033904
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, one of which points to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, contains text related to 'mcsa windows server 2016 study guide pdf free download', suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous Shopify links, while mostly benign, contributes to a link farm pattern.

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/wix?keyword=mcsa+windows+server+2016+study+guide+pdf+free+download
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/55679870476.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9617/files/81069980976.pdf
    • https://cdn.shopify.com/s/files/1/0458/6405/9033/files/18779591169.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/20917105117.pdf
    • https://cdn.shopify.com/s/files/1/0430/5397/3657/files/offline_mode_steam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/organic_functional_groups_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5111/files/8112739379.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2245/files/renew_texas_drivers_license_online.pdf
    • https://static.usrfiles.com/ugd/b8c837_92285239dda64af3bd69be43a5aa0015.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed4c20ac26ab43e2b305166b466f6bc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_549668fe74c84a5fa69fdb3cada5376a.pdf
    • https://static.usrfiles.com/ugd/3e87bf_475f3ad1008c424a9299cf58b6920d15.pdf
    • https://static.usrfiles.com/ugd/8b4172_7c6b970a1cc949f38d992577f3b9a067.pdf
    • https://static.usrfiles.com/ugd/2f7815_c427ca509d1b488b897257f8bd134e40.pdf
    • https://static.usrfiles.com/ugd/b8c837_12b032929c1c4d90a34db89513d70f04.pdf
    • https://static.usrfiles.com/ugd/906e9f_97ec58d746124e49a94459b6e38251e7.pdf
    • https://static.usrfiles.com/ugd/764aaa_89cbaeb4b3a1489db5fded4def4f4682.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_off00007be6.bin
8c580390e7c5eb8c239a14583fb262980e3f6f7c69ac521270e667a713436f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE6 6064 bytes
font_01_sfnt_off000090b9.bin
49fb1a924d875cb0623ad82a38a21b32bb7679507f3b067128d3e30d6bfcf31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 10736 bytes

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