Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c22ea733e02423…

MALICIOUS

PDF

34.4 KB Created: 2020-08-11 17:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1772bade05e62a6335422ef765259ad9 SHA-1: ca6d9e1f836b1c5f5eac9982f2ab0d8a7745218b SHA-256: 49c22ea733e02423928eba39403bc091a6aa66197d612617888309c62e4995af
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for software serial keys. The document also contains a large number of embedded links to other PDFs hosted on Shopify, likely an attempt to manipulate search engine results for malicious purposes. The ML classifier 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/wb?keyword=corel%20pdf%20fusion%20serial%20key
    • http://files.abbeypsychservices.com/uploads/1/3/0/7/130739856/fozufubuja-tolonari.pdf
    • http://files.lakesidepresnurseryschool.com/uploads/1/3/1/4/131438692/963e6af3eddc.pdf
    • http://files.fabiomanda.com/uploads/1/3/0/7/130739616/04fadd574f022.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/78647838214.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5203/files/burepawafanixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/jekusuwararegew.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/64316274367.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/flatulence_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/worejedigujebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodujanizovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevegijetowid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0435/2924/0727/files/xupodab.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_off000046f2.bin
1a40094ba1064ff1ac9f20ae2704f1bf3f7babba105d4b480a7ea2cb88ca1229
pdf-font-stream PDF embedded font (sfnt) at offset 0x46F2 5108 bytes
font_01_sfnt_off0000586e.bin
83a8d4269f7fe65323de7829cb23eb89befe2e33094e1f9c47654cd30edfa0b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x586E 10180 bytes