Malicious PDF — malware analysis report

Static analysis result for SHA-256 2483ab934cbc4a7a…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 07:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 080540830f37bf15d9bb559efd3a0075 SHA-1: 3a35c26b20841bd995d021edf80f557b6d8a6106 SHA-256: 2483ab934cbc4a7a96c8b905bb7f3eec788a805ceab7d58b4b5d9d993f4ca175
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a book title, likely used as a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, suggesting an attempt to game search engine results for malicious content. The ML_NYX_PDF_MALICIOUS classifier also strongly indicated 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.cc/wb?keyword=introduction%20to%20corrosion%20science%20edward%20mccafferty%20pdf
    • http://files.olgaflamenco.com/uploads/1/3/0/7/130740524/baromixagiz_saritebilorizo_zinijep.pdf
    • http://files.lcanavigators.org/uploads/1/3/2/8/132815008/863442.pdf
    • http://files.davidheinick.com/uploads/1/3/1/3/131379049/lotezubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/95540080057.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/68584528571.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/53325883221.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/xakapenigajitevopijem.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/ponirogolutoluxav.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6556/files/rafepabexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/venowevuzunixijifade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/526428265.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/41673431010.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/98247870374.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/look_of_disapproval_text.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d8d.bin
8034064d766fb660ef2f3c6091fc119ce2a5d57f523306d161e8087ad927a813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8D 5280 bytes
font_01_sfnt_off00006f7c.bin
30724ac3117610b5ef6bdc95acb19ab826f087851ff57cd1625e681f8508868d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7C 10160 bytes
font_02_sfnt_off00009220.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9220 4324 bytes

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