Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd67807d68f7b9d…

MALICIOUS

PDF

43.7 KB Created: 2020-08-19 16:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218584408878ab0fd759e95eab666d4b SHA-1: fe7b1f1180924893178464131f20121bf9031298 SHA-256: 3bd67807d68f7b9d76abbae6cfcf7a6254f8c5b305a46a5db62c5a7c4ee38cbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to legal summons. The primary malicious IOC is the redirector URL, which is designed to lead users to harmful content.

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=form+to+answer+summons+complaint+california
    • http://files.pnc1948.org/uploads/1/3/1/3/131398231/7524001.pdf
    • http://files.winonahouseconcerts.com/uploads/1/3/1/4/131453316/3047006.pdf
    • http://files.ewb-ur.org/uploads/1/3/2/6/132681976/bamemalaravuvop_zavazivabasefig_vagano.pdf
    • http://files.ignitethehill.com/uploads/1/3/1/4/131408439/kajegojix.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/39607802353.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/9258415175.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/musabevopab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/yale_acceptance_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/71438027761.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/nibapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/dna_structure_and_replication_crash_course_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/66757947925.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/pizoganosodila.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9880/files/bbc_english_grammar_book_free.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_off000064bc.bin
053646b1495b7e9ca27147edb613d28348b50def39dc74c0755c0f9e0e30a3ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 1616 bytes
font_01_sfnt_off00006cdb.bin
09fc6f1a8a1d98f8de808f8f053464605b769c37da62a691b0ee45b137c729cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDB 5208 bytes
font_02_sfnt_off00007e89.bin
e284b69358bd30b1635f37d5e334022d0d19f53795bf92ee1f34155db9fb6b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E89 10156 bytes