Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c4bf73a02006ca…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 08:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43c1001b6b3ad765bf7ecf7026306438 SHA-1: a0b26e391d653204c047219d2efaa73dd28a91e0 SHA-256: 17c4bf73a02006cadc85266c291d41875a2044c3110b8f57d6834a1ca6adbb22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are part of a link farm designed to manipulate search engine results. The primary malicious URL, 'https://ttraff.cc/pify?keyword=dividing+rational+numbers+worksheet+pdf', is identified as a known malicious redirector. This suggests the document's purpose is to drive traffic to malicious infrastructure, 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.cc/pify?keyword=dividing+rational+numbers+worksheet+pdf
    • http://files.rosshimliephoto.com/uploads/1/3/1/8/131856161/2094607.pdf
    • http://files.wileychemistry.com/uploads/1/3/1/4/131407102/mudav_taxogezesax_mavebimukup.pdf
    • http://vikikop.elsolpto.com/uploads/1/3/1/8/131871478/24060363.pdf
    • http://files.balmybreezetrainingcenter.com/uploads/1/3/1/3/131383864/tosadinawuzidifod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/zogoxusoduv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0723/8567/files/comprehensive_effects_of_globalization.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/43381715455.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/famegobavojerimuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/26271413557.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/2017_honda_civic_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/88029592247.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/gedumarutidi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/57588764029.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0437/0736/7592/files/54740446177.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_off00006056.bin
b76692eb27c964ba037888110f6835022936e72774ca21778a8f9eda1745a574
pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 5812 bytes
font_01_sfnt_off0000740c.bin
0c1cde3f87302f5d9e13f08a44de28ed920b2beca1b683d906ed447402ecd797
pdf-font-stream PDF embedded font (sfnt) at offset 0x740C 10132 bytes