Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce1877a8eba2b8…

MALICIOUS

PDF

42.2 KB Created: 2020-07-14 14:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b8f384d01f8248b6618e7bb6d873da5 SHA-1: 3b3b249e4a69a0c904dc1ad1e22705f7a6a8348a SHA-256: 66ce1877a8eba2b8f2e368a17a36c1bb59e55738d4563fe9c71fb087ece204ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous outbound links suggests an attempt to lure users to malicious sites, likely 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.ru/pify?keyword=already+yet+worksheet+pdf
    • http://files.studioofcreativity.com/uploads/1/3/1/4/131438658/gijar.pdf
    • http://files.forasong.org/uploads/1/3/2/7/132740545/844ef9.pdf
    • http://files.betterwithoutbaseline.org.uk/uploads/1/3/0/7/130776478/gazixexewusaj.pdf
    • http://files.jacquelinesalvador.com/uploads/1/3/0/7/130775752/luzisanutisefori.pdf
    • http://files.monaghanmentalhealth.com/uploads/1/3/1/4/131406826/lanojus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bapanitajaj.files.wordpress.com/2020/06/51775948494.pdf
    • https://surefab.files.wordpress.com/2020/06/neziwolase.pdf
    • https://nitiguw.files.wordpress.com/2020/07/wajituwoxajanuwexe.pdf
    • https://mabozewunes.files.wordpress.com/2020/06/jewep.pdf
    • https://burelixub.files.wordpress.com/2020/07/27162525879.pdf
    • https://rokutazak.files.wordpress.com/2020/07/xovetebupeduxuvetab.pdf
    • https://legebepome.files.wordpress.com/2020/06/jafapiviw.pdf
    • https://setozedipupu.files.wordpress.com/2020/07/joxenivaduzorib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/51623346437.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/15758601631.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/45869709466.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/23520478790.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/gufonowelipewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/47994973328.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_off000068a5.bin
789be277de429034f26f6dec6f2b46318ead3d1fdd9056548c1a01778f3dd78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 5008 bytes
font_01_sfnt_off000079d8.bin
5f7a5a9abc5f006bf9868dc78fcdc053e7609d71fe72a8b5ce393add3a384525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D8 9680 bytes

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