Malicious PDF — malware analysis report

Static analysis result for SHA-256 66989c66eae47bdf…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 09:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a529ccef4ba8d8b1097dedff1a7df1 SHA-1: 42e519853a6c8de7b6dcbf742a24fadb6b1b1728 SHA-256: 66989c66eae47bdf8a3c2b1ccc578b2b6a62f432bf0b5a60574fa3dac0131a02
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a visa form, aiming to lure users to a malicious site. The heuristic firings indicate the presence of a link farm and a malicious redirector, strongly suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

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=thai+on+arrival+visa+form+pdf
    • http://files.axaofalps.com/uploads/1/3/0/8/130813906/tosofesebiw.pdf
    • http://bejut.fflnwo.org/uploads/1/3/1/4/131407440/kivewusipukiluzeg.pdf
    • http://misefiz.cambridgeintlschool.com/uploads/1/3/1/3/131383541/bced432f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/godul.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/66122677069.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/metabolism_of_sulphur_containing_amino_acids.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/17782032727.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/xiwelemubebixuwajedop.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/14730414280.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/7540871770.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/posavitilesivub.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/siyavula_grade_11_physical_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/9866/7163/files/ansi_sql_2020.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_off00006081.bin
57b07fbd836c43f95a47b2da43bede025c39c54eb83ef5bbac283765dfa9af63
pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 5292 bytes
font_01_sfnt_off00007253.bin
d3273ccafd577a2abb7d7faab99d1ecf4be97ea45bb5ab0f8f9bf06faef473fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7253 10024 bytes