Malicious PDF — malware analysis report

Static analysis result for SHA-256 115a5fe0b048c2c1…

MALICIOUS

PDF

51.5 KB Created: 2020-08-10 02:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 831a0d6d4801d8583fe5dd8579bb1c33 SHA-1: eea7ecc278fe46661dad7d296ecc4c27382f6bbf SHA-256: 115a5fe0b048c2c16b8bcfbf7c31b775a894859e963e9c34cb201552c1a2edbd
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'August 2020 calendar pdf editable' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.cc/pify?keyword=august+2020+calendar+pdf+editable
    • http://files.garywautry.com/uploads/1/3/0/7/130739084/xofan.pdf
    • http://kugudado.sweethavenlavender.com/uploads/1/3/2/8/132814930/xuforixiwedi.pdf
    • http://dulim.tradecanadanepal.org/uploads/1/3/0/8/130874104/meredizerokoz-bumisu-dubavezenaxip-lukowisobo.pdf
    • http://files.katymorrisonphotography.com/uploads/1/3/0/8/130874582/49710cd3b46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/iphone_8_max.pdf
    • https://cdn.shopify.com/s/files/1/0447/2560/0410/files/couchtuner_mr_robot.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/gucci_mane_off_the_leash_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0428/7302/8775/files/sepewasonodojozupuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/19589884224.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/30447967047.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/zowizubaxuwiwizonibudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8783/6822/files/biblia_de_jerusalen_completa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/56837566017.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/32340116943.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/cutting_edge_advanced_answer_key.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_off00007f7a.bin
784532edf2389ad9edea79d1a097cd94fa9f30195b8f2d8e7089bb7d0d68c996
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 5728 bytes
font_01_sfnt_off0000930c.bin
83639e055c7d1fad4b75b3a0c542696446acfddd123b7248081963f07039a0a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x930C 14632 bytes