Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b07ac8642b3c24…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 07:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b48bf9fc6ece6190f1bb3aea1741cb SHA-1: 7e0eb94cd1bbec728ef3c6d40d1b0f2f711f4c4f SHA-256: a7b07ac8642b3c2484dc9c2115b1618d8b1b041a82a807a23cb44442ed4db28f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same URL, suggesting a lure for users to click on it. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute malicious content. 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.cc/wb?keyword=journalism%20dictionary%20pdf
    • http://files.uwcmun.org/uploads/1/3/0/7/130776592/litizatekafekepiteku.pdf
    • http://files.robciccotelli.com/uploads/1/3/0/7/130775017/pefid.pdf
    • http://files.artouchconsulting.com/uploads/1/3/1/4/131437249/fbede9273fa1c.pdf
    • http://files.thelittleburlapbarn.com/uploads/1/3/0/7/130739112/5172341.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/english_speaking_course_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/2298/1032/files/tofiturudakavimape.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/applied_mergers_and_acquisitions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/83172368874.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/lujajaloxipaxalasirit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/niposoperasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/juzorolawoxurul.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/jakibomizenubimixuduvow.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/gabimel.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/84821128168.pdf
    • https://cdn.shopify.com/s/files/1/0440/6195/0117/files/sogosaxes.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7079/files/convert_to_word_online_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/56068749827.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_off00007b72.bin
394d0710638fdd1d38a365c7baa4c207fd62f110d1b4ad7c67c3b8a29512b9ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B72 5392 bytes
font_01_sfnt_off00008dbb.bin
2fba161d9bafd5358ad0c9abb87a1787398ce387476abe8b03cc0c917d2b5294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBB 10128 bytes

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