Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2a2754d932ef48…

MALICIOUS

PDF

41.4 KB Created: 2020-08-20 08:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ab335f381b459054e117ad8c4f3508 SHA-1: 76443f0909cf74104827f40f23f79fa6e73b5ceb SHA-256: 7e2a2754d932ef481025c84fe4c81533d53b6c448e851297761f0995625bcc42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body itself is heavily obfuscated and contains a mix of seemingly random text and URLs, suggesting an attempt to manipulate search engine results or lure users to malicious sites. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirection or link farm attack.

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=abbaigaru+songs+ing+come
    • http://files.engmandesigns.com/uploads/1/3/1/4/131438616/gikoj_rebuliraru_vamifodas.pdf
    • http://zigopoz.barriegardenclub.ca/uploads/1/3/2/7/132740873/zurokafeduvila_folej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/this_house_has_people_in_it.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/hackedgames._com_rise_of_the_kings.pdf
    • https://cdn.shopify.com/s/files/1/0452/1276/2263/files/sway_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/pes_2013_crek.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/wirijonegigixaxuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/96804530556.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/varicella_zoster_virus_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/rinesetukuxadatukajipobez.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/32101251488.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/kibisaguterosomix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/kiketepaxenazil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1265/files/20328847491.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/tagimanep.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_off00004492.bin
521db6ca8b200a0710b35711c090563c301a8f412d773b4660282f951e1afab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4492 3540 bytes
font_01_sfnt_off00005124.bin
b9c6a1ec1199def0037411a1e53cba7f2d6ffb07d939853497b6d746d9a815b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5124 5216 bytes
font_02_sfnt_off000062be.bin
e5a3e4f7d8e3a8eb8077039a17562c3ba96c83db6419e766b6bb6048641e678f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 8976 bytes
font_03_sfnt_off000081b9.bin
a9049e2740f28e07ceae22d5f1e2fc0df0884d12edefc4f119790aeee9b14a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B9 16196 bytes

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