Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef519b139c3eb8ce…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 10:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45c4bce4ad8f5220a1c7a458eaaee0f SHA-1: a29e28fbfd6d8b40f66a81b6dfd581f7b441bd6c SHA-256: ef519b139c3eb8ce5b631d814247885f8b37f01192deab0b506661c22149a313
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains a large number of embedded links, forming a link farm hosted on Shopify. These links ultimately redirect to a malicious URL, ttraff.cc, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious links within the document.

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=boolean+example+in+android
    • http://files.onehopecoc.com/uploads/1/3/1/4/131453216/86c530c.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/medical_genetics_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/diwekuziliwikovaxaxupisit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8407/7473/files/senaniwawokisikiragoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/78985489659.pdf
    • https://cdn.shopify.com/s/files/1/0439/3366/3400/files/chevron_scholarship_application_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/56374552554.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/vejepobep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/47693820115.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/85416174079.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/chrome_labs_settings.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/84255586928.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/article_370_urdu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627c.bin
5bfc3db1d86061fee44269655f03010462340453fe701f3aa5d348e5ef470053
pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 4752 bytes
font_01_sfnt_off00007278.bin
de0b4f32a4089286a8ad33085f92853aacb292c472c7031e039b87d4841fa455
pdf-font-stream PDF embedded font (sfnt) at offset 0x7278 10212 bytes
font_02_sfnt_off00009559.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 4324 bytes