Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d3f9c4197929f4…

MALICIOUS

PDF

66.1 KB Created: 2020-09-10 08:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 373f7114a1094d66e2812bacd5648164 SHA-1: abea06dc2027f3c506d3b1860498fe973b5981a7 SHA-256: b5d3f9c4197929f43fb31d14c061473bf81ca362975a1d9dd0fe5df6e3adc150
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary intent is to lure the user to a malicious site via a deceptive 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.me/wix?keyword=momentum+and+collisions+worksheet+pdf
    • http://files.bridesewbeautiful.org/uploads/1/3/1/4/131453674/napagotobemiwa_xubodo.pdf
    • http://pedapa.pnanorthhouston.org/uploads/1/3/0/7/130740199/a15233b8577.pdf
    • http://files.bylnj.com/uploads/1/3/0/7/130776403/f81acff.pdf
    • http://files.papayabranchboutique.com/uploads/1/3/2/6/132696512/firegewip.pdf
    • http://files.wendybrockman.com/uploads/1/3/0/9/130969728/dubawifelevez-mokizomo.pdf
    • https://static.usrfiles.com/ugd/57c819_aa817d52102846d987282a1d114151aa.pdf
    • https://static.usrfiles.com/ugd/48d9a1_7e5c4374725b4f76b41bfb23d9994cfc.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_7021f598979b41e1992a5688f8b86108.pdf
    • https://static.usrfiles.com/ugd/b8c837_905ba10ac67c468cbc64db95c1d6ab47.pdf
    • https://static.usrfiles.com/ugd/3b5dd9_bea518050f234311848aad3660087211.pdf
    • https://static.usrfiles.com/ugd/41a0b6_7bb17e98020e4659aa63ea5c2116dccf.pdf
    • https://static.usrfiles.com/ugd/ca300b_1877c23b568c4b1e9606d45cd8adb625.pdf
    • https://static.usrfiles.com/ugd/01e791_97b043469e9d40608704896d8cba81b0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/cidco_housing_scheme_2018_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8349/files/79445673271.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_off0000ad27.bin
b7506b0405dcd203e3cefe40c22cee343376ee527fdfb2b72a2beef074faf793		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD27 5556 bytes
font_01_sfnt_off0000bffd.bin
dc7456ad8c02cc89b5c02fc093afda778dd15e141fbd9774a2f546d7f99e2543		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 11188 bytes
font_02_sfnt_off0000e5ff.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 16060 bytes

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