Malicious PDF — malware analysis report

Static analysis result for SHA-256 133431618f99fe29…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 06:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19874f217af06645db6adee7df6fda8 SHA-1: edc4d807bccf78301440bb496119f9ef1d374f23 SHA-256: 133431618f99fe29bd762ae12bab86a9c5b66e1d03c1da515af19499773c77f3
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 benign Shopify domains, but one critical link redirects to a known malicious domain. This suggests the document is part of a link farm designed to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector URL is a high-priority indicator.

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/wb?keyword=one%20minute%20manager%20meets%20monkey%20pdf
    • http://files.rockinghamcountyncdems.com/uploads/1/3/1/4/131437967/9503897.pdf
    • http://jipika.randrpressurewashingllc.com/uploads/1/3/1/8/131856330/7989132.pdf
    • http://files.dontcrampourstyle.com/uploads/1/3/1/4/131407665/lemefemidunu-kemefol-sosebetanumir-xojerogibos.pdf
    • http://files.choongmootkd.com.au/uploads/1/3/0/7/130776180/4dfc68ec1e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/yasin_tahlil_latin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/kirolikimujejek.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/eight_characteristics_of_research.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/affirmative_and_negative_sentences_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/6798/1474/files/ukp_akreditasi_puskesmas.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/85740100665.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/bejijaguzabax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/sewajonekaraduzelixeviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/worlds_of_fun_map.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/cara_membuat_bookmark_dengan_adobe_acrobat_reader.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/58771221423.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/golinumalaludurawapuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/nimijaxizepasa.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_off00006163.bin
9d10010c8cbd5a652ff532245641064b790f25084a56943d102794da0b5d7398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5524 bytes
font_01_sfnt_off00007422.bin
40d88299211a3d9c2f8756abc3a03be9bac6b2ce43a6fc858b86a15d89bcb8b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7422 9008 bytes

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