Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fadd25c29fbb93…

MALICIOUS

PDF

45.6 KB Created: 2020-08-16 10:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c5e33a9e15aae7cbfa35d6266470591 SHA-1: f2284d1bbcfcfc89e69c3dfc1fd79cfadd0b8b03 SHA-256: 74fadd25c29fbb935ebc264a848447114435cf7f0cf38924d4c9d67632df5ab7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to potentially harmful sites, likely delivered via spearphishing.

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.com/pify?keyword=academia+boa+forma+sapiranga
    • http://morunowu.luxuryjourneytravel.com/uploads/1/3/0/7/130740025/379928e311d1d2.pdf
    • http://vimukidu.jewelrysalehub.com/uploads/1/3/2/8/132815732/mujewavimuwiluz.pdf
    • http://files.violetduanmu.com/uploads/1/3/0/9/130968921/faxikirodokitavi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/81912149454.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7203/files/22638971870.pdf
    • https://cdn.shopify.com/s/files/1/0429/6831/8105/files/homeostasis_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/6425/4883/files/73266988502.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/xebonaxujuni.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/15317440460.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/accelerating_your_learning_curve_andrew_wasson.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/12027065839.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/pubevagafatezigogigame.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dfc.bin
348442cdbd3492a7abf9647e88384b271f117a65e523d492ab99fc666281555d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFC 5572 bytes
font_01_sfnt_off000060c6.bin
a8dd37f71fb15798c01a2c52db7a3509695d993ef6773dc37755a944370533fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 4236 bytes
font_02_sfnt_off00007099.bin
d810121e335b20d9ce03a31a73d975b1f806e8c42222d7ed253950fd716f7ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7099 10232 bytes
font_03_sfnt_off000093b9.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B9 16312 bytes

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