Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ea12d455c9d6f…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 21:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1f28a6543c964624bb9f55c8fd9305 SHA-1: a96a5082b280833a7bbe10344b77b008a4a14c1b SHA-256: d88ea12d455c9d6f923f3f13c569882e1e8f3c79c1d5cb724edcde88bc99ff18
128 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector link. This suggests the document is designed to trick users into visiting a malicious site under the guise of providing free educational materials. The presence of numerous Shopify links further indicates a link farm SEO abuse tactic.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=free+printable+worksheets+on+indefinite+pronouns
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/tipowikagikijotofaruzu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/dozefekofuzijewemabege.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/83498380760.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/hernia_hiatal_articulo_medico.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/15825435442.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/39505297400.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/94952798090.pdf
    • https://static.usrfiles.com/ugd/79e5df_2b5bfdd895c6455e93bd354bfc28acbd.pdf
    • https://static.usrfiles.com/ugd/6d59ab_f2c81fb400b44583a4bd5cbd38ee86cc.pdf
    • https://static.usrfiles.com/ugd/2ca09c_c52358c8ae5843b39acdd20337bad06a.pdf
    • https://static.usrfiles.com/ugd/5926b4_79d27874383f4e11a595b48e9744898e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd8c060f0054c4aaf48efed9692b423.pdf
    • https://static.usrfiles.com/ugd/941881_2f6185126c9147369af686f1369a48b7.pdf
    • https://static.usrfiles.com/ugd/b914b5_5d2137dc1f0d4deca5aa334226b28ccf.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_off00005b6b.bin
dccd3c22867f2942697958916e3b7104705de3ccb919be27280a3e092b1e109e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6B 5380 bytes
font_01_sfnt_off00006dc0.bin
97ad3e36e85a8377385e937e72bf9dcbd92fe4f407f14820877d2af0f3bd5ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC0 11604 bytes

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