Malicious PDF — malware analysis report

Static analysis result for SHA-256 71008e789460527f…

MALICIOUS

PDF

49.5 KB Created: 2020-08-21 13:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c8514cdd82eb7ed63fa7cfe9851cc1 SHA-1: 84d96c76a0b791e923f8759f7cba9c29e419b4ad SHA-256: 71008e789460527f35db32b723ccd26f62e8972c055fc386190f3332474b4628
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a PDF redirector link pointing to a known malicious domain. The document body also contains the same malicious URL, suggesting an attempt to lure users to malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious intent, likely related to phishing or SEO poisoning.

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=lirik+lagu+answer+love+yourself
    • http://files.mybeautifulsky.com/uploads/1/3/0/8/130874224/2593985.pdf
    • http://files.freeartistmutualaid.com/uploads/1/3/1/3/131379759/8531828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/79288618312.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/someone_like_you_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/kiwedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87913440599.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5159/files/mcgraw_hill_math_connects_course_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/fisico_quimica_castellan_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1109/6221/files/83278753125.pdf
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/25993609049.pdf
    • https://cdn.shopify.com/s/files/1/0428/0467/4727/files/peluretebibara.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_off000064af.bin
2e391be9f670ab77b2f2a3d9304f1ac769f9dfd0b29f1d946d7854b6df96832a
pdf-font-stream PDF embedded font (sfnt) at offset 0x64AF 7492 bytes
font_01_sfnt_off00007d34.bin
707c0122d67b86099523cecaa302d114ea53a51e1b41891dfe8fe4f0c9fb0920
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D34 5196 bytes
font_02_sfnt_off00008f11.bin
4863a6db5caf55b99f23062ff3084b3f12448228554c65987df6c309a0a35372
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F11 13092 bytes