Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff2f5f26caabaa…

MALICIOUS

PDF

38.9 KB Created: 2020-08-01 06:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c536a27db220f05df5bf9a0a44c136af SHA-1: d2318fdd697a1a515f13d31da170e0682477d788 SHA-256: e8ff2f5f26caabaa9b11f8dc5928432f9723e3755c1e272f6c10bee19a4df4a0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a Craigslist ad lure. The document body, though heavily obfuscated, contains the same URL and references to Craigslist. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs hosted on various domains, many of which are benign Shopify links but others are unknown. The primary malicious URL is https://ttraff.cc/pify?keyword=craigslist+fresno+free+stuff, which likely leads to 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.cc/pify?keyword=craigslist+fresno+free+stuff
    • http://files.jacksonpottsii.com/uploads/1/3/0/7/130775858/figelujosus.pdf
    • http://files.phillyiday.org/uploads/1/3/1/6/131607712/lijipajosuvekizuga.pdf
    • http://files.strikedebtportland.org/uploads/1/3/1/6/131606133/69899.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/filokemojudanuludogafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/volinejubivewotiwotukifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/wonutalegikixomij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/89666501070.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/49040865773.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/29151168449.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/9742630600.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/the_blade_of_the_endless_paths.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/13813489195.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/31772196168.pdf
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/74072601515.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/romufapuwi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004838.bin
98392b76f4122b40306e12336573b97dc54bb7b11a467377bef1ef099e46bcc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4838 4840 bytes
font_01_sfnt_off000058ba.bin
91dcbec7b8c856e88c9786c43f0b42fe58171d5dbfb832b6374364ad5a915a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BA 9556 bytes
font_02_sfnt_off0000798e.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 16144 bytes

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