Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f37b5bf0acf007…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 10:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04f7d2f5730ef6ab0468d2285c374df5 SHA-1: 11e2bb22b3ee628b9a29cd49b2739c2f0101e85b SHA-256: 99f37b5bf0acf00750d63a9fc7bec426cfbd0a15f5ff2e8f55db24473b7a17e9
128 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic indicates a malicious redirector link to ttraff.cc, which is likely the primary malicious payload delivery mechanism. The presence of a visual download button further supports a social engineering lure. No scripts were extracted from this sample.

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.cc/wix?keyword=specs+on+samsung+s9+download+speed
    • https://static.usrfiles.com/ugd/ed64d2_162a3f2739a34c27b3fc7329b7a47208.pdf
    • https://static.usrfiles.com/ugd/b8c837_eef65faab57c451da30947b4172d077f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3b7e6ba1dcd4a3a8e9da07b81913988.pdf
    • https://static.usrfiles.com/ugd/90c678_79146d5ce5fa4adea1d75aee587fd301.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1b9eaafee024ac588beca8e65b2ae98.pdf
    • https://cdn.shopify.com/s/files/1/0451/7848/6933/files/anchor_ceiling_rose_price_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/bike_logo_png.pdf
    • https://cdn.shopify.com/s/files/1/0433/8778/1276/files/86099177017.pdf
    • https://cdn.shopify.com/s/files/1/0443/9543/0054/files/reglas_de_asepsia_y_antisepsia_en_enfermeria.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/party_next_door_sls.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f7374e4ddc74456af9432fd1a30e279.pdf
    • https://static.usrfiles.com/ugd/0d002d_282533a0b9d54e418a6dcdc55ea17b0d.pdf
    • https://static.usrfiles.com/ugd/362633_00b9283a1a524dc2b3eec641e6b3ea70.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ea90ecca954ddb8538d840114365d5.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/how_to_create_shapes_in_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/6827623534.pdf
    • https://forums.androidcentral.com/showthread.php?t=984561&s=acb58bb2564904cd2c6f164daa062692
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://forums.androidcentral.com/showthread.php?t=984561&s=acb58bb2564904cd2c6f164daa062692
    • 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_off00005f73.bin
9a265cbdbb1919743623329514dfa69f91a6317fbeedde51d152f14f4cba4ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 5648 bytes
font_01_sfnt_off000072a2.bin
42e89f00f5cb78903bfd1d4f31313504a9df234a6f4358e111e787c1cdd9bf46
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 10624 bytes