Malicious PDF — malware analysis report

Static analysis result for SHA-256 1976b4f91995656b…

MALICIOUS

PDF

38.5 KB Created: 2020-09-17 10:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90739025548535bd20ffe86db11261d7 SHA-1: edd05db0f21c7a3df7e925ecd0ca936446e20904 SHA-256: 1976b4f91995656b25b302d6a8efec09c91c1cd68c754b96d31a1eae5af9df01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.me/wix?keyword=bau+cua+ca+cop+dice, is presented as a lure. The document also features a large number of other PDF links, suggesting a link farm, with many pointing to Shopify domains. The ML classifier strongly indicates 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.me/wix?keyword=bau+cua+ca+cop+dice
    • http://files.remeretreats.com/uploads/1/3/1/4/131408415/ledidasa_pezesujumiveg.pdf
    • http://meluzel.booknookrevs.com/uploads/1/3/0/7/130776247/be18314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3242/0262/files/67565002378.pdf
    • https://cdn.shopify.com/s/files/1/0438/3123/0624/files/chemical_principles_zumdahl_8th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3925/1870/files/31026030581.pdf
    • https://cdn.shopify.com/s/files/1/0436/9419/4843/files/golden_blue_leg_baboon_tarantula_care_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3289/3857/files/walking_dead_s07e15_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/voice_activated_teleprompter_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/jagisasalogosezabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9263/files/zutejuromupageri.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/kuliraxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/7712/2713/files/24144239650.pdf
    • https://cdn.shopify.com/s/files/1/0431/5748/7778/files/23933598287.pdf
    • https://cdn.shopify.com/s/files/1/0437/0920/2597/files/black_formal_dresses_for_sale_in_johannesburg.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_off000051df.bin
510ce51e4e5946db07ec8afdd9d88a66ee5f379a2450b2265bb27f991df59a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x51DF 4812 bytes
font_01_sfnt_off00006251.bin
7358b91cd20740c3e11d90559b0455366e7d2bfb2493d3af7680a760ddeb48e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6251 14768 bytes