Malicious PDF — malware analysis report

Static analysis result for SHA-256 877bf9ebe279fc5b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 10:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1f9072d0156568ed510406f9b522e0e SHA-1: 7a81fa042c981a0f5e70fdc3dd83064b3df13164 SHA-256: 877bf9ebe279fc5b077bc33bb70070d1a4ea4bb613514ce367ed4a5318f0f0e4
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a social engineering lure to trick users into clicking. The PDF also contains a large number of external links, as flagged by PDF_SEO_LINK_FARM, indicating a potential link farm for SEO manipulation or distributing further 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.club/wix?keyword=read+vc+andrews+books+online+free
    • https://static.usrfiles.com/ugd/362633_51cedfb995b648009fc206b6518a2a34.pdf
    • https://static.usrfiles.com/ugd/b0b521_e1ebfc9bc29e42199b6cd09e8c8bb302.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_eedb7c9492444f8ba0e4e4d573320059.pdf
    • https://static.usrfiles.com/ugd/82e28d_3594b35d85ab47958303d1851b6a638f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa41ffa18ba4e1197b953e9ff1370bf.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/paxodipumolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/why_cant_i_hear_discord.pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2687/files/kaganapan_ng_pandiwa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4300/2270/files/makalah_apbn_dan_apbd.pdf
    • https://cdn.shopify.com/s/files/1/0437/8722/3198/files/67357204128.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_a30e0a4ad4294b459e5b3e9dfae1d76d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec86922705b3465d918955a86c9d42d7.pdf
    • https://static.usrfiles.com/ugd/122077_09d14f23b10c4b60ac45dccc591e2a50.pdf
    • https://static.usrfiles.com/ugd/32acb1_09c79145bab645d8a2c89f453e0d8973.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c48052946144b0ab0da24408f636f6e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/97269733866.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/amphotericin_b_nephrotoxicity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70282461387.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/jovejelimofifogibit.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_off0000746d.bin
e5c3f6cd074b9714acb450e5913ed6ea2eb41f4cab69db2a8d2e9418e39ff963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746D 5376 bytes
font_01_sfnt_off000086d6.bin
ede441987b3fe7ba346cbfcb93cabb0c5d1b8d26a4d25afee79888545b2228ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D6 10444 bytes

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