Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1595fcf8d69a8d8…

MALICIOUS

PDF

43.6 KB Created: 2020-08-23 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a78ef49941c37db8044bb16bad96c4 SHA-1: 49ed628376db68d225ae13da86e9c614b5d4eb9a SHA-256: e1595fcf8d69a8d8183f49787709b87763d53d742ff0b334dc59892ea0c51cb0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=yearbook+templates+google+docs', which likely serves as a lure to further malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=yearbook+templates+google+docs
    • http://files.fbcmaysvillemo.org/uploads/1/3/0/7/130739404/kamesifagu_wikodusa_xefoj_tegokopiroz.pdf
    • http://files.cosmicreality.net/uploads/1/3/0/7/130775368/a50bcd902.pdf
    • http://kukapila.barbadosottawaassoc.com/uploads/1/3/2/6/132696414/gemeleg_wubebilopata_jajiwopopujotol_vapavatimebu.pdf
    • http://files.thelandfillchronicles.com/uploads/1/3/1/0/131069819/8a045168db56.pdf
    • http://files.mw-earrings.com/uploads/1/3/2/8/132814958/1566487.pdf
    • https://cdn.shopify.com/s/files/1/0437/7611/4837/files/95173356648.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/70165231966.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0352/files/como_ganar_masa_muscular_de_forma_natural.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/minecraft_skydoesminecraft_servers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/aua_guidelines_prostate_cancer_staging.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/86174403653.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/99732720574.pdf
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/nusesaxepomimumalijuxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/futijifinerodujumagos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f0.bin
8d3b948940a91cb50fb26b12e5e9356498a8cd7741afdb2ef76719b3fa188e46
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 5556 bytes
font_01_sfnt_off00007cb5.bin
17a4fd951335a12533986d7653a197aa7ab188df0a321575c3ef2a0ce3bad370
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB5 10808 bytes