Malicious PDF — malware analysis report

Static analysis result for SHA-256 0119799ca089654c…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 08:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3104c848f5dfe72e2aba6816810a37d SHA-1: 41fe559928ca42313ac2e99220eb6dec8ffbf8be SHA-256: 0119799ca089654cbb4e51b6ca76b665a220174ebc9cf2221c06fa9b694dd842
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of a large number of external links suggests a link farm or redirection strategy.

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/wix?keyword=aj+rafael+we+could+happen+ukulele+chords%253D
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/d775a9_a4b610a6b5f94b2d861cc8cbc09666c7.pdf
    • https://static.usrfiles.com/ugd/b0b521_fc412bc38fcf4e72a0147e60313d47b7.pdf
    • https://static.usrfiles.com/ugd/16a96a_138b279ab7174622b1b93394dd4e6eca.pdf
    • https://static.usrfiles.com/ugd/91e123_a4ea4b5f5ada4f1890857f17b5905fa8.pdf
    • https://static.usrfiles.com/ugd/345929_b316c0a775604f7f91a723c53dab0db2.pdf
    • https://static.usrfiles.com/ugd/cf79db_b55f98ec204742d3b5d938e49598e429.pdf
    • https://static.usrfiles.com/ugd/c63dba_5242aa1875b542c7964c32241833cb5a.pdf
    • https://static.usrfiles.com/ugd/735424_c01d3dc1ec0d4a93a1e1710e1422e2f9.pdf
    • https://static.usrfiles.com/ugd/7041e4_7fd226243b7940418048b63ab6e5f9ff.pdf
    • https://static.usrfiles.com/ugd/e73fea_97920721b5e440c08289682f8f804272.pdf
    • https://static.usrfiles.com/ugd/5438e3_7eab1c430e6e49a299660187848d4bc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4abe030a28849f59177128ae9d76235.pdf
    • https://cdn.shopify.com/s/files/1/0460/6561/5003/files/suvizezimimerakegugub.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/alice_in_wonderland_movie_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/wukakujuxarukajuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/xazigidosipezebapu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601e.bin
ebfe23e00b6505770b3260b67247a93357ad468c3165df019ed9c7f2296e9700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601E 5264 bytes
font_01_sfnt_off0000720e.bin
4c6fe77dbaf0a8f813a97bb9561d3fc4a49ef51311a47d0c71b598368a4dc697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720E 14196 bytes
font_02_sfnt_off00009e58.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E58 4324 bytes

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