Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c476af96f25996…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 16:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3311bc6a9c1bffdc8abc8d9ef726722 SHA-1: f4f98c84367491beabeb0930bd9191cee4b275d5 SHA-256: 10c476af96f25996b6e4f450ebaad8ed17660980404543604c8e77f8991f06e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. This indicates a likely attempt to lead the user to malicious infrastructure, potentially for further exploitation or phishing.

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=caulerpa+racemosa+pdf
    • http://files.preducationalsolutions.com/uploads/1/3/2/6/132695662/6412502.pdf
    • http://files.charmsandsparklebyria.com/uploads/1/3/0/7/130775402/nulis.pdf
    • http://files.heartbirthandbaby.com/uploads/1/3/2/6/132695535/9707626.pdf
    • http://files.northglennhs.org/uploads/1/3/1/8/131872079/gusavatefivipo.pdf
    • http://files.sarahbaptistart.com/uploads/1/3/0/7/130775528/towojixomuba_jesozik_mepujevawaw_zokujutojunit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/90088978414.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/52722672507.pdf
    • https://cdn.shopify.com/s/files/1/0434/3241/1298/files/50275671689.pdf
    • https://cdn.shopify.com/s/files/1/0438/4643/4976/files/download_streaming_video_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0436/7102/7865/files/xubiwapikosudibor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/coeliac_disease_review_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/8349/6600/files/48596751401.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/pekolepevojerufalap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/54700516445.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/17405229903.pdf
    • https://cdn.shopify.com/s/files/1/0433/3223/9528/files/7835811748.pdf
    • https://cdn.shopify.com/s/files/1/0441/1890/0888/files/bsc_1st_year_math_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/rock_and_roll_part_2_lyrics.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_off00006b1b.bin
04f83fe11365e1964921c47b6ae5208cbc7f6893748a9be25923099860154e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 5208 bytes
font_01_sfnt_off00007cb6.bin
95574b8648d2255001aa183ca28d78c62f99354a9f3a172b467edbf39c9ed1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB6 10328 bytes

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