Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abbc075bb98ae89…

MALICIOUS

PDF

48.4 KB Created: 2020-08-23 18:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff17a683abbe372d9e4c793834f91aca SHA-1: 2d324e240868c1c81c976c6ac8f95e4ffaa35576 SHA-256: 5abbc075bb98ae89572e546ae98b9300a2a80cc240a22e0bf87dd6ba55c09be8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm or SEO spam campaign, aiming to drive traffic to potentially malicious sites.

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=cold-+formed+steel+built-+up+section+properties
    • http://files.stdavidscarrmill.org/uploads/1/3/1/4/131407227/petixage-genitikujoz.pdf
    • http://files.findjasper.com/uploads/1/3/1/1/131164573/zozododafudojonupe.pdf
    • http://files.pristinepropertyok.com/uploads/1/3/1/3/131398452/majoxamimafuz.pdf
    • http://bajabuv.swedishcicerone.com/uploads/1/3/1/3/131398440/a79a1725d66f.pdf
    • http://files.spokanehomeinspectornextjen.com/uploads/1/3/2/6/132680874/8848038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/2462/4288/files/pdf_to_word_doc_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9189/files/odoo_technical_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0435/6227/0879/files/debogegilok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4986/files/sri_bhagavatam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2655/4781/files/wabaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/18493033771.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/wegimozif.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3660/files/betuxezunukipozimojix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1510/files/lexical_verb_and_auxiliary_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/10229733085.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/jewokafakofimuzilofupuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/29297059501.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/64736969476.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_off00007ed8.bin
ce525020c964aab23f89c3d22d97edb7816559edd5eacb8e2e17ed645296f05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED8 5168 bytes
font_01_sfnt_off00009059.bin
2b8fad4b0ba3ce89e8e82dd079bb4da9a92b6248f57c6b2d9f20b52d2f9420f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9059 10408 bytes

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