Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b6a1cb7c680a8f…

MALICIOUS

PDF

33.3 KB Created: 2020-09-09 23:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec64cc405c58831aeb0e173dd1e46927 SHA-1: 4748fa8476ed0bbc49dc94c4d26bccb848c91b81 SHA-256: 73b6a1cb7c680a8f6f169a0a15e37fe64b9dfe9e25c60199ea467fd62bd3d3f1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this document as malicious. The embedded URLs suggest an attempt to direct users to external sites, likely for phishing or malware distribution.

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=seek+logo+vector+free
    • http://gelavubej.impartalliance.org/uploads/1/3/1/4/131407592/beduzewizoveges_tuxeganupon_vozijib_moguxijuwur.pdf
    • http://wedad.first-contact.org/uploads/1/3/0/7/130775598/7499234.pdf
    • http://files.jillskoglundphotography.com/uploads/1/3/0/7/130775516/8580082.pdf
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
    • http://mawizagof.mytalismanuk.com/uploads/1/3/0/7/130739593/6841313.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/angel_answers_oracle_cards_free_online_reading.pdf
    • https://cdn.shopify.com/s/files/1/0449/8338/6280/files/astable_multivibrator_555.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6254/files/42112367643.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/caracteristicas_sociales_del_adulto_joven.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/55458799536.pdf
    • https://cdn.shopify.com/s/files/1/0431/1639/6697/files/iptv_smarters_pro_apk_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/wuwetujipozowori.pdf
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/daftar_riwayat_hidup_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8807/files/sailors_wainame_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/najajajoxosekugavutolesum.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_off000047e2.bin
97186faeb2b8421803cdac48c71b55326c39e2eaba41311e956f840cec72b94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E2 4888 bytes
font_01_sfnt_off000058ab.bin
25386758e1a5a307a183956f158624acac8b6b8f040ee450c1f2813f409f0cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AB 9364 bytes

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