Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1557b8c91c17aa1…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 09:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c72bd219c8490f6dd647c6e6f9afa39 SHA-1: 97c0049575c85e71920fea81b5a482a06ed3e7a2 SHA-256: d1557b8c91c17aa10b45cec37394653505499ef743d50d1f434b688619a57781
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the same redirector URL and references a tutorial, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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=autodesk+inventor+2020+tutorial+for+beginners+pdf
    • http://files.echostage.info/uploads/1/3/2/8/132815220/rikamirumusaribuvubu.pdf
    • http://files.parkviewyogaandmassage.com/uploads/1/3/1/8/131871642/0b1a9c87bb50.pdf
    • http://files.carenharrisphotography.com/uploads/1/3/0/8/130814611/1943539.pdf
    • https://cdn.shopify.com/s/files/1/0433/7238/0310/files/boruteti.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/widobesoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/affairscloud_monthly_february_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0507/files/bawinodu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/21076519342.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/ramejinuxomepefako.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/34461709735.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/39293732250.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/xedivudum.pdf
    • https://cdn.shopify.com/s/files/1/0432/9527/7214/files/jomixipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/46163076101.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/92020049611.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_off00005c37.bin
c08d38d7818e4680c24a588aa443ee707f2537e7e578b2d4dd2e2adacf2493ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C37 5736 bytes
font_01_sfnt_off00006fd4.bin
55f36a1a60bc7f5a79dab38eb811f6f239199041753ac4f31ad2450ecd78d8b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD4 10204 bytes