Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ed97f5530b0c9…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 00:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70259a9d47b2c08d52fb2724c8bb3ccd SHA-1: 33f7d0ecc4713d15db134a11b0e7df6afec4a965 SHA-256: 5f3ed97f5530b0c90890dda7d4e7ca0c16d1a41f147b4e6cb3104fc0b351f40d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'Stardew Valley'. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm intended to obscure the malicious destination.

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.com/wix?keyword=stardew+valley+bait+how+to+use
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/faginorugoxiruz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0382/9657/files/download_battle_for_middle_earth_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/83769403003.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/mechanism_of_cell_differentiation.pdf
    • https://cdn.shopify.com/s/files/1/0462/5052/4823/files/65328577875.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/anemia_en_el_embarazo_2020.pdf
    • https://static.usrfiles.com/ugd/111c46_6a94813d75284b17a4751d17c794e957.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e2bf76a4b564dcda30c20787716851e.pdf
    • https://static.usrfiles.com/ugd/fedf23_6358ea23c5c84accb714c5479b53ab74.pdf
    • https://static.usrfiles.com/ugd/a64c8c_6f96fcd210364b3d8af1dc86cf044a03.pdf
    • https://static.usrfiles.com/ugd/43d598_96ed1f71b4b24c6d9c2487386d8e6a3f.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/change_mac_address_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/32590031761.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/
    • http://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625d.bin
c2b0e6192ebd216ddd81a3c393af3170b6c56f43c6bbce193ff8c7c5ada22266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625D 5412 bytes
font_01_sfnt_off00007488.bin
3329e6bc427230422ee0a7440c44b0e462f48898dcab89bcf52e81eed99e3ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 6180 bytes
font_02_sfnt_off0000837a.bin
9920e8c164c4284b41319a9fc3432e468028dd97588be3d40fc80a02e3f2a823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837A 10344 bytes

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