Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b9dd2623090d0f…

MALICIOUS

PDF

41.3 KB Created: 2020-09-17 06:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ce4cec231391434f44ba0e916e290b1 SHA-1: 6f93ebbd48641194c124497e9a7df511f274e961 SHA-256: 77b9dd2623090d0fb7d449005d21d18c30698e38941f00a596692cc720c452c3
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 malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a car sale and the malicious URL itself. This suggests a phishing or scam attempt to lure users to a malicious site.

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.me/wix?keyword=2016+subaru+outback+manual+transmission+for+sale
    • https://cdn.shopify.com/s/files/1/0443/3153/2444/files/chrome_os_usb_bootable.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/96634020132.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/87030881089.pdf
    • https://cdn.shopify.com/s/files/1/0432/7358/4793/files/algebra_2_larson.pdf
    • https://cdn.shopify.com/s/files/1/0466/9030/4164/files/66450061127.pdf
    • https://cdn.shopify.com/s/files/1/0440/9176/8984/files/bulats_english_test_format.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/nopiselanazaluvokebure.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/cartagena_map.pdf
    • https://3229146d-6b3c-43d6-bd5a-aca3f71b69fe.filesusr.com/ugd/86319b_ab33680ef6cb4e0a9149872ec87f5bbd.pdf?index=true
    • https://b05786cc-ad5a-46ce-a87f-f61c89e9182d.filesusr.com/ugd/d31907_039e96986ea844bb9ba4803f2d770a05.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/butubupuriv.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/twist_song_hd.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/17834668618.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_off0000577a.bin
81cf71cd766668ffd48dd8626733dea84c08d27698c2b9eacb75372d4ed51c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x577A 5616 bytes
font_01_sfnt_off00006a81.bin
1b4129bf946ac2403643617762acee10321e9f7f905aebf5e3e9ca6232bbe600
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A81 14724 bytes