Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f1f98c674a558…

MALICIOUS

PDF

42.5 KB Created: 2020-09-04 18:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a38d3d641eb86d1bdcbe0b1d0640ead1 SHA-1: ac7f274695956ece146f04dbb91205738a3b7ce7 SHA-256: 740f1f98c674a55870c16201e793f24d8ed356a6b05614eea3385311967eb21b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.me'. It also exhibits a PDF link farm heuristic, with numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/pify?keyword=mastering+concurrency+in+python+pdf', suggesting a lure to download a PDF, which then redirects to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/pify?keyword=mastering+concurrency+in+python+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4226/5498/files/cengage_chemistry_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/business_dinner_invitation_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/59345545489.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8571/files/allen_bradley_series_c_inverter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/fojisejuwejulesikopi.pdf
    • https://static.usrfiles.com/ugd/739437_f86e392b56ee4c9f9a71387908b3f742.pdf
    • https://static.usrfiles.com/ugd/6116da_704d3ffbca534de5b0e8a558a5e5751b.pdf
    • https://static.usrfiles.com/ugd/defcb2_43a49bcdd02b4ccfbe5191ad3d1f414c.pdf
    • https://static.usrfiles.com/ugd/9c8fb9_6375013c1af846da9eace07e83cb118b.pdf
    • https://static.usrfiles.com/ugd/a43ec6_7c183e7523bb4c3a8cccf884a0ad555c.pdf
    • https://static.usrfiles.com/ugd/516574_7ff75560a3864c6ea24578c128303df4.pdf
    • https://static.usrfiles.com/ugd/ed64d2_91805b72e46942dcbd766ebbd718aeb4.pdf
    • https://static.usrfiles.com/ugd/436160_368dc866783e43a39179f20c73daee71.pdf
    • https://static.usrfiles.com/ugd/bae363_48164c948afa472bbf7d9acc8c82a800.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006787.bin
2e407b964c7092c86bac0eeb2731ea9c9efc50444abafd65e773bdffaa138c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6787 5492 bytes
font_01_sfnt_off00007a43.bin
f54131be8fae2eaf072d07c0f9e5543a13e9ef7ff6eb0d2f1eda9d41b4aaac0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A43 10208 bytes

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