Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f146bb9e103488…

MALICIOUS

PDF

37.0 KB Created: 2020-08-23 11:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7948cdaf4f787d050d5aa79f3cd420f SHA-1: dff9e311f4a4aded8adba7a5ccc8caf5d7aa4ebf SHA-256: c8f146bb9e103488c81c523c78001d6b0aa52cb7b95b7dd739634af58cb449f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though partially corrupted, contains text related to 'Wordscapes answers' and a malicious URL, suggesting a lure to a phishing or scam page. 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.ru/pify?keyword=wordscapes+answers+level+946
    • http://files.bigvillagelittlecity.com/uploads/1/3/1/8/131871954/winibanudimipefa.pdf
    • http://vakijato.polarbearfastpitch.com/uploads/1/3/2/6/132695203/dekiniwuxefomosatub.pdf
    • http://megel.cochinmotorcycles.com/uploads/1/3/0/8/130814717/431054138209449.pdf
    • http://files.stewartislandnews.com/uploads/1/3/1/3/131384424/memakowogulejurid.pdf
    • https://cdn.shopify.com/s/files/1/0428/0378/9991/files/burrraahh_full_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/24288409945.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/wowirokejipuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/mawujuba.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/psicologia_que_estudia.pdf
    • https://cdn.shopify.com/s/files/1/0430/3224/8469/files/anton_aubanell.pdf
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/hex_to_int.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/wepaninaxonilexuzisivo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/tadidorexokadagogif.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/73_and_74_amendment_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3233/0908/files/zisezoguxedikagabufil.pdf
    • https://cdn.shopify.com/s/files/1/0429/5055/7855/files/buranelafigetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/96734553634.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051f7.bin
7f5e01ea83885344739c2e135346b1271ec87d5484432a676d837d5ef47e84e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51F7 5632 bytes
font_01_sfnt_off0000654c.bin
11f1cdd747ec67dd857621df2511f76bf34975929463de7edd245ae4d9c4d749		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654C 9868 bytes

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