Malicious PDF — malware analysis report

Static analysis result for SHA-256 88919d2631914587…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 06:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0ac8e7179640d6a26e40aa772e4d3dc SHA-1: 919f44d11a298d0dec55699803e51d6402d01450 SHA-256: 88919d2631914587ce6b2b3823c1d363709a97c4580362c050ced555fb1ee44b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious URL, indicating a phishing or malware distribution attempt. The document body's title, 'Screen shot on macs', is likely a lure to entice users to click the embedded link. The presence of numerous external PDF links, many of which are benign, suggests a link farm used to obscure the malicious destination.

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=screen+shot+on+macs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/bf0735_b329ed2563544729818f230ee34ac548.pdf
    • https://static.usrfiles.com/ugd/0d2908_cd4d6a6a204d4d78a5092d33db617fe9.pdf
    • https://static.usrfiles.com/ugd/72216b_59694af9d060495b81a712d9371cbce5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb29977c52a348d393c4cc9969d8b762.pdf
    • https://static.usrfiles.com/ugd/bfbc46_58563e70cb0649e49b72aba8ca0ddf77.pdf
    • https://static.usrfiles.com/ugd/b8c837_568298390be145088837aed6660c98ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_9977ba73851845d7a55f34bee9c89297.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/13964741728.pdf
    • https://cdn.shopify.com/s/files/1/0447/9349/5709/files/blouse_cutting_images.pdf
    • https://cdn.shopify.com/s/files/1/0443/1269/0844/files/majlis_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/38488236029.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5ccd4701b2d4f4f9a250e922d0e93c1.pdf
    • https://static.usrfiles.com/ugd/764aaa_076771a8e9ea46a080115391d8bdfedd.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000642b.bin
61169ca8e36842bad188ee511ba1e88c52e316940b7e0895f1d59e1e4ad4a64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x642B 4848 bytes
font_01_sfnt_off00007452.bin
4f6cfadcd1c63775481f8d9271dd673fe3791583a8d349acedbd13a928288460
pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 13208 bytes
font_02_sfnt_off00009ebc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBC 4324 bytes