Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dedbe3ddcfce75…

MALICIOUS

PDF

35.6 KB Created: 2020-08-31 06:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f18404c2eb31f6733b8ac96687ff17a SHA-1: e873fefd8609ca8b7490038f1b5e6f581c1161be SHA-256: a8dedbe3ddcfce7539789ade3334f6e9ac3a29499d8f7adbd423f85e941727d9
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 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits a link farm heuristic, with numerous links pointing to Shopify domains, one of which is the primary malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=performance+management+herman+aguinis+3rd+edition
    • https://cdn.shopify.com/s/files/1/0438/0858/7938/files/ielts_listening_recent_actual_test_5.pdf
    • https://cdn.shopify.com/s/files/1/0460/1305/5137/files/english_file_pre-_intermediate_workbook_answer_keys.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/3268774855.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/24854340938.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/kakuxow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/vazajuxazozubefa.pdf
    • https://cdn.shopify.com/s/files/1/0438/1612/4576/files/afl_fixtures_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/bogefuxuwabugogujol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sibubemazalomasedexikeme.pdf
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/javivatir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/99867674198.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/wonidodifegifoxujozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/pulunejasafomisoroleli.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/rudesajilokewutudobad.pdf
    • https://cdn.shopify.com/s/files/1/0454/4128/6294/files/motif_batik_nusantara.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_off00004d39.bin
ca8d6873958c6e2693684812e366ef3ff8753ad42d6e18e2194a3f0dbece1b72
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D39 5568 bytes
font_01_sfnt_off00005ff4.bin
274eafeea0ff6c601deffa786ec86114421c2c9e24335a33c334f7aad5404186
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 9804 bytes