Malicious PDF — malware analysis report

Static analysis result for SHA-256 670f4400dfb9f0d8…

MALICIOUS

PDF

45.8 KB Created: 2020-08-16 11:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e957f460ed8d21f658cf0f3c7f7bfa16 SHA-1: 4d6d7bb4dfa3858249fc488e030b671db6d3b945 SHA-256: 670f4400dfb9f0d85eb3d75ec7be3eedaa909c7403b78e8f316c5cb0e0d9570f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to malicious sites via these links, likely as part of a phishing or scam campaign.

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/pify?keyword=apa+standard+of+perfection+pdf
    • http://tegipis.surfacetoairsystem.com/uploads/1/3/1/8/131856394/e34016ff71.pdf
    • http://files.illuminatethejourney.com/uploads/1/3/0/7/130738917/xenakodedosifow.pdf
    • http://files.visaconnection-philippines.com/uploads/1/3/2/6/132695280/7ad51fa803.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/70764724934.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/96477246477.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/rijudikopiwonuguzeri.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/kashimashi_girl_meets_girl.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fonufefijosogigu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/sedonenuxag.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/lirik_qasidah_muhammadiyah.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/71594795222.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/gelamolafusozufuxesam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/69244948681.pdf
    • https://cdn.shopify.com/s/files/1/0438/2087/5938/files/56630948970.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000692e.bin
7e44d3c17595ca8d8131beb8805deb8c19a533485c727bab9ed385f865c555f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692E 4892 bytes
font_01_sfnt_off000079ce.bin
1183a7a916210a7b11ab998952f8cb2d842c8e4e87ff1954d96f0d2c63a81f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CE 10008 bytes
font_02_sfnt_off00009c1c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1C 4324 bytes

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