Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fb498142fa49d4…

MALICIOUS

PDF

41.8 KB Created: 2020-09-07 07:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c626f12503eae3f20819804f23c8678 SHA-1: c7a08b9066fce05ea7643512db3d6363285d0b3f SHA-256: a8fb498142fa49d40fd74c9e4619bb724aac839cabd219f4340c2a1985f15247
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=operating+manual+for+bosch+refrigerator', is designed to lure users into clicking it by impersonating a refrigerator manual. The file also contains a PDF link farm heuristic, indicating a large number of external links, many of which point to benign content, likely for SEO manipulation to increase visibility.

Heuristics 3

  • 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.
  • 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.link/wix?keyword=operating+manual+for+bosch+refrigerator
    • https://static.usrfiles.com/ugd/e3c460_2f14d24a0d614726950cc52789e6b508.pdf
    • https://static.usrfiles.com/ugd/52b593_bef4d9960b994617afae1a86c38680b8.pdf
    • https://static.usrfiles.com/ugd/fb41f9_6dd4eedb44ae4b31a0b613d2a8fb76a6.pdf
    • https://static.usrfiles.com/ugd/2b98a3_f156a6a775dd437bab253daa1527308a.pdf
    • https://static.usrfiles.com/ugd/2c7c49_f098928360d24fdc83b780c0c6ffebb0.pdf
    • https://static.usrfiles.com/ugd/32777b_cd889e91049341a8940001ee2cd61873.pdf
    • https://static.usrfiles.com/ugd/4c4e45_d5c723271bf546a5aa0487ca498cd693.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8039/files/2020_porsche_cayenne_turbo_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/chrome_flags_dark_theme_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/fda_e_portal_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/7178/0504/files/quran_yasin_audio_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/56305342211.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/87637094180.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_off00006542.bin
ca390b3f77edf66bd0ec79c9072c969bdf8993fbea144d817f6449f8ab99bbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6542 5596 bytes
font_01_sfnt_off0000781c.bin
c5a545aceb9860b5ae9f7f53c2e247cb0ea0714500197c08eca6b2504601e3cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 10032 bytes

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