Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6ff44bc7c9c82f…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 03:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f787b90fb010812b69e690515afae021 SHA-1: f8a88124d3984405534aad1d9bdf1bc51c0ec1ff SHA-256: 1d6ff44bc7c9c82fa05622fa583aa62791e5e1a9fca14e445adda0e655d401b4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wix?keyword=basic+english+speaking+pdf`. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The PDF also contains a large number of embedded links, many hosted on `cdn.shopify.com`, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=basic+english+speaking+pdf
    • https://cdn.shopify.com/s/files/1/0440/7489/3477/files/biodata_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/virog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/50710443231.pdf
    • https://cdn.shopify.com/s/files/1/0435/8048/9891/files/firuwojidib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/barron_s_ielts_practice_exams_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8106/files/museboxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/contact_form_7_email_template_html.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/kimadinojenaku.pdf
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/vizilapivumofalebikoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3802/files/35948806384.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/46307516755.pdf
    • https://static.usrfiles.com/ugd/374ce0_43a773afcd13418ebe1c96d35dae5f0f.pdf
    • https://static.usrfiles.com/ugd/15cd4d_48bef142785747a69d09a7d3f9a6edbb.pdf
    • https://static.usrfiles.com/ugd/b7ed05_b86ad1c801cd4108b7d1224536b4789d.pdf
    • https://static.usrfiles.com/ugd/ae059d_45ab5a2daba04477988818d7b5998e83.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_off00007f7a.bin
3a1ecfab2df9e210c28871c00211cd2e448af55b1d16830295796acfff0d047e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 5436 bytes
font_01_sfnt_off000091e9.bin
251c3f2df16667192231ef80e21a546761cfeb6ea3a811d19b577f79d00e2e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 10060 bytes