Malicious PDF — malware analysis report

Static analysis result for SHA-256 0677eb190c81ee98…

MALICIOUS

PDF

39.8 KB Created: 2020-08-07 03:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b13955cbbbf2b309288feae7129a043 SHA-1: b4544a463b7d99f2a2781a0c5726afe8da0ab22b SHA-256: 0677eb190c81ee98390b4d88ccac7a201a41253f2eb6c2dc93e4207413b8147d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=pdf%20reduce%20file%20size%20free%20download'. This suggests a phishing or scam attempt, likely using the guise of offering free PDF tools to lure victims to malicious sites. 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.ru/wb?keyword=pdf%20reduce%20file%20size%20free%20download
    • http://files.jjewelsstudio.com/uploads/1/3/0/7/130776567/sifil.pdf
    • http://files.superbloomcoffee.com/uploads/1/3/1/8/131871704/13bc9f9b3d5a6.pdf
    • http://files.twig-designs.com/uploads/1/3/2/8/132814073/beradozopafubedapono.pdf
    • http://nerijada.philadelphialogisticscenter.com/uploads/1/3/1/4/131482975/5510622.pdf
    • http://files.tlkpowdercoatingmalaysia.com/uploads/1/3/2/7/132740723/gikogikugobibi-foxizan-vuleripagufe-tekoguvana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/united_heroes_league_kenshi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/bixorijokar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0448/3658/5629/files/autobiography_of_a_coin_in_1500_words.pdf
    • https://cdn.shopify.com/s/files/1/0444/0319/6070/files/perencanaan_sumber_daya_manusia.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3814/files/getinepiribufoxerigome.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/25766748581.pdf
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/2620673868.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/vanemobukedupidofal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7518/files/xidedijimonewivavolenopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zudofujavulasosajawigubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/kisuxezibomujexaveb.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_off00005f07.bin
5b48899edc61f8de395dee3633d6cb65c963c989687ce14fbe15062e1bca00e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F07 5156 bytes
font_01_sfnt_off000070c2.bin
92e9a65d9f1e6bca9d25a92b969c2c9a3d92f2c758d3c5efa2ec31c6bb2b9132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C2 9832 bytes

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