Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f0228f36f05cd7…

MALICIOUS

PDF

49.7 KB Created: 2020-08-07 04:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba536fc4b759db6a8af86a0f17f88588 SHA-1: 5b8dfe44587b8f34eabbe1ae831db190d977ef16 SHA-256: 61f0228f36f05cd78fa88e7d009dc29b525c580ded0fe705133a7017d24eee09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious content. The ML 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/pify?keyword=conjugaison+du+verbe+avoir+et+etre+pdf
    • http://files.iwai-izmir.com/uploads/1/3/1/1/131164048/3564441.pdf
    • http://files.shaeshaeshae.com/uploads/1/3/1/4/131406827/zezejujumo-miwoxoporomep-bezedun-nolag.pdf
    • http://files.tableandelights.com/uploads/1/3/1/0/131070733/kadididuwisura_bukujorezi_pupofaxidope.pdf
    • http://files.glba-urban.com/uploads/1/3/1/6/131607407/lififixezovepid-wusuxox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/kazob.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/lisibesumisewikok.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/63877943982.pdf
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/12503113003.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/statistical_analysis_in_simple_steps_using_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/98619579865.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4177/files/josupekorekudeleziguku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/pibasuwikubepolukem.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/46135111950.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/69444729959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/34902062.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_off000061c0.bin
040aa5e7d9e96f99de1a68e6109e2dffeb5e2e12d2be1efd2490bd3b971a35d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 5356 bytes
font_01_sfnt_off00007404.bin
2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 2268 bytes
font_02_sfnt_off00007e17.bin
ba5e302023a49c779c9c04500cccab3098f01aee20e8702db5e13049c20386f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E17 11804 bytes
font_03_sfnt_off0000a37f.bin
4b806f6c24c883d23ee1a6e3b27a063905f58f2534f8fca8018bf7c5a7831200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA37F 16256 bytes

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