Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebd0df80456956e…

MALICIOUS

PDF

35.8 KB Created: 2020-08-22 18:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f3583b73dc19508a53e79da6ff4494 SHA-1: c616f18a7e491e13bed66af9c57b2af5cb474f75 SHA-256: 4ebd0df80456956e718ae56a599cb8a5918294bd4702a8131363d03349452b4b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Asus ac3100 manual'. This suggests a link-farming or redirection attack designed to lead users to malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/pify?keyword=asus+ac3100+manual
    • http://files.kivistocarwash.com/uploads/1/3/1/6/131607407/57421.pdf
    • http://repodi.gbmphealthcare.org/uploads/1/3/1/0/131070487/7662492.pdf
    • http://files.newhopepcusaasheville.org/uploads/1/3/0/7/130775306/3b5bf1323e7.pdf
    • http://dijes.lizsowersburas.com/uploads/1/3/0/7/130775413/9260285.pdf
    • http://files.hvacsolutionscoloradosprings.com/uploads/1/3/1/3/131383586/f78d23c296429.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/wazikukamidogizoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/lewuginojaxalilak.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/112414673.pdf
    • https://cdn.shopify.com/s/files/1/0452/2590/2240/files/84987879567.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/zadejo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/fixiwewaxegimara.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/xesowitubapokoxiwixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/zigiluzake.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7901/files/pestel_analysis_of_banking_industry.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_off00004dad.bin
2c8f0f730a56d5a36e86cf7a1eba73bf925159ef8b6ec6156d03d3a16d78ef4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAD 5196 bytes
font_01_sfnt_off00005f43.bin
9e8dbccb515248c0e28320e3abf92f14a0ba460e4c18a8b7942d566cf2dcb40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F43 10260 bytes