Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af66b1a17df8c53…

MALICIOUS

PDF

49.7 KB Created: 2020-09-05 04:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237684fe2d054918b1a585ebb31dd368 SHA-1: 29b54cb96a6145e20d6591fbc2af42ba58d723f6 SHA-256: 9af66b1a17df8c532b0a97239c0a22b618f89e4f14426a1a030a797375f3a375
154 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, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. The primary malicious URL is https://ttraff.link/wix?keyword=english+animated+movies+2019+free, which likely serves as a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=english+animated+movies+2019+free
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/88922246116.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/disco_elysium_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/vatigisivofimajorikes.pdf
    • https://static.usrfiles.com/ugd/b8c837_07bfda3f47ad47bc857ddf167f47618f.pdf
    • https://static.usrfiles.com/ugd/5b9a87_a705ccca4f54487cbb64fd2f1018a1a8.pdf
    • https://static.usrfiles.com/ugd/6f53d7_d8148e92049e452fa915793279bfa369.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/nedemenika.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/tanewunateku.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/mifabovitus.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/puchd_date_sheet_2019_bca.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/vubeterogebaxageg.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c386b6eac7244b1864d68e86a4d93ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2ec2532ab9414db6307d41b171cbf8.pdf
    • https://static.usrfiles.com/ugd/a4ea6c_b8cbf7d743e24748ba53164b8fb1bd31.pdf
    • https://static.usrfiles.com/ugd/f46427_228c5173e00c4646a762019944a834b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b47872eb1fc74acd89e7d333ae2f581c.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_off0000747f.bin
8afd29452dc8ef31d7ed147b255ca59bd7849bab79d5649aa833dc8090e910c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 5608 bytes
font_01_sfnt_off00008770.bin
9503908d2ee3ce620d2b177604f6b6b111de3072431a347adfd6e7cbb20def88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8770 10600 bytes
font_02_sfnt_off0000ab98.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB98 4324 bytes

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