Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fe11925912d642…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 14:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17019eb48569ba6004578b26a0bb170b SHA-1: 1454616681fd5e43fda3a88b7b965a0c5f3e7459 SHA-256: 21fe11925912d642b643051fbb4c746bda45adcb00abcb413bd97d3266374663
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text fragments that appear to be related to 'Apple boot camp 4' and the malicious URL, suggesting a lure. The PDF also hosts a large number of external links, many pointing to Shopify, which is flagged as a PDF link farm. The ML classifier strongly indicates 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/pify?keyword=apple+boot+camp+4
    • http://disusi.mindfulnessdvd.com/uploads/1/3/0/7/130776445/4548856.pdf
    • http://files.nicholasmongiardocooper.com/uploads/1/3/0/9/130969424/b0bd025b3a.pdf
    • http://files.felicity-taylor.com/uploads/1/3/0/7/130739456/1717216.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/82241609395.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/27285346832.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/different_types_of_computer_network.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/91290432160.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/british_council_reading_practice_test_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/gunifegobapes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/26284127350.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/63650020720.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/dexiwewanajavatifaparig.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/15162904574.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/fairy_tail_276.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2998/files/burj_khalifa_full_hd_image.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/nolejimepepesofepepufuzi.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_off00005e4b.bin
6f1866babd2bbe83bdf086cc96dbb7b0c7350e7b689640df23e63810d9dbeb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4B 5020 bytes
font_01_sfnt_off00006f50.bin
a0d736e31f639e7e52b4d5224837035dfb5172c529d425a07c50f61d34620ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F50 10588 bytes