Malicious PDF — malware analysis report

Static analysis result for SHA-256 655f695215bb7484…

MALICIOUS

PDF

38.4 KB Created: 2020-08-24 09:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc41661511e7dce82fbd227f37b2de5c SHA-1: 978b56f218e5ef91fc1958dbbe32e5e12166f6f3 SHA-256: 655f695215bb7484be6d5819ca2d3ebf6ca970ff794243d20cefb107c82aefdf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body also contains the malicious URL, suggesting an attempt to trick users into visiting a malicious site under the guise of providing free Instagram photos. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates a phishing or scam attempt.

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.ru/pify?keyword=instagram+photos+for+pc+free
    • http://files.emilyrobards.com/uploads/1/3/1/6/131606631/nuluteduramose_lataxasatimapa_tibejazadome_pavevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3371/4070/files/30366202813.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/dupuwamugefofuwos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7926/9541/files/67878342649.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/time_value_of_money_table.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/story_central_student_book_6.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/88377422121.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/organism_classification_coloring_page_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/abundance_mindset.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_off0000599a.bin
90a587f59314a4aefeb1e73095833a86367dbcfa97bd42b968674cfce1346c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x599A 5332 bytes
font_01_sfnt_off00006b8b.bin
d74df0829f43694b609886230a8653b63400b1540920e248125954dd53a9bf5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8B 9964 bytes