Malicious PDF — malware analysis report

Static analysis result for SHA-256 89837c590ecef8cf…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 17:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddab162562ff1edef35a7945d5effd41 SHA-1: 304a737f0e25c656866e64c56b99329e141cfe5f SHA-256: 89837c590ecef8cf45ef21fc9d3cca5b935df2f229e1fc808f906cb433cf2cb8
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. The primary malicious link, https://ttraff.link/wix?keyword=manual+capsule+filling+machine+where+to+buy, is identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains the text 'manual capsule filling machine where to buy', suggesting a lure to entice users to click the malicious link.

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=manual+capsule+filling+machine+where+to+buy
    • https://static.usrfiles.com/ugd/32acb1_ba8fc514d76343bbb9126ee7405e1248.pdf
    • https://static.usrfiles.com/ugd/c5d40f_d3afe1f2cf6249c3942f41dc43ce3951.pdf
    • https://static.usrfiles.com/ugd/ca300b_c2234617d4404b959378c2c964030264.pdf
    • https://static.usrfiles.com/ugd/d5d855_cdbf5db228144e459d3163306347bb5f.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_5fb6ace7a16e4ab3969981a0929b2047.pdf
    • https://static.usrfiles.com/ugd/ae059d_0ff7c6b37c194fc59c13c3c5c70f01d0.pdf
    • https://static.usrfiles.com/ugd/fedf23_6fa4986ae3f04be48feb788ce40bb3d5.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_c7507071ce044b2f9696600a8b5f27cd.pdf
    • https://static.usrfiles.com/ugd/ea78e0_0b716455aff8424e947731f3975804f9.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_caabb2a08da843ae8bd103a4733417f8.pdf
    • https://static.usrfiles.com/ugd/f0f215_264ce874c22841aa99fdb2203dce0da6.pdf
    • https://static.usrfiles.com/ugd/221f3a_631758fbb48f49849db5c884eda745e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd7c2cbe24154071b1c4f85a204a4481.pdf
    • https://static.usrfiles.com/ugd/30e015_bfc083e0973746b582c0138371bf6a7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cfbb0cd28954f08be2aa5ff55d086c3.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_off00006282.bin
3febcb64d849c3b78f3d320f094ca619ad12526c906b77f629ed2814237f1dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6282 5652 bytes
font_01_sfnt_off000075a3.bin
658630e823db85ff3caf2ea6d3ca2a5775ad5f971a4508bdf4fc3ff10fc0746d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A3 10184 bytes
font_02_sfnt_off0000987f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x987F 4324 bytes

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