Malicious PDF — malware analysis report

Static analysis result for SHA-256 161ffbfd6e089146…

MALICIOUS

PDF

39.0 KB Created: 2020-08-14 20:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68b65b49476c100c292bd0716ec87c4c SHA-1: a4247ef4ec5e9733834be259b189d33babd6c457 SHA-256: 161ffbfd6e089146f226df8e2294fe0e4dc7322e15afab627987a4c3fe36cfb0
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link to 'ttraff.com', indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to merging PDFs and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=merge%20pdf%20in%20one%20page%20online
    • http://files.bayouvillageschool.org/uploads/1/3/2/7/132740798/zesafelugibilerono.pdf
    • http://files.landscapedesign360.com/uploads/1/3/2/6/132682230/pudonozuwixo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/rivivejedegajobebima.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/67375906012.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/pefodix.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/70123126394.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/morebimekijimukavute.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/lozokibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/biography_of_rabindranath_tagore.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/gozomep.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/newute.pdf
    • https://cdn.shopify.com/s/files/1/0434/6186/9733/files/sovutezajisamapak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/buronutabazoralapupevabe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5716/files/berlin_conference_1884.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_off00005d78.bin
4be09abe4ccb8f7822dc4da1aa0128d6164a5077b89105718996fedf6c2fb367
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D78 5036 bytes
font_01_sfnt_off00006eb0.bin
c03af168118c9b5ab3e671132f598794ae333bbf684cada48220bfb7ec92b9ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB0 9728 bytes