Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bf9b8ac7771361…

MALICIOUS

PDF

51.4 KB Created: 2020-09-09 15:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf0bb28e2b83d11dbbdfd96ab0ac92c7 SHA-1: 01208c884d6261a3ef41188044f1b32cb07db77d SHA-256: 39bf9b8ac77713610aa2228662fc24fd379e230f1bf9f96e24a74185226064ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that lead to a redirector URL, which is a common technique for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute content through numerous external links. The document body itself contains obfuscated text and a URL that appears to be part of the lure.

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.club/wix?keyword=corporate+brochure+cover+design+templates
    • http://files.rangerssupply.com/uploads/1/3/0/9/130969075/zozurituvu.pdf
    • http://files.hopefulbyhope.ca/uploads/1/3/1/4/131408100/zagazajavemepijotot.pdf
    • http://files.devinadouglaslaw.com/uploads/1/3/0/7/130776489/wakupuzoxifumomumox.pdf
    • http://nepelori.talltaledesigns.com/uploads/1/3/1/3/131398455/dabam.pdf
    • http://files.walkercenturyfarms.com/uploads/1/3/1/0/131070151/xuvutun.pdf
    • http://files.stonycreekenglishshepherds.net/uploads/1/3/0/8/130874524/4d6f2c6e6cae5.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/gevadilekavamobavakubisew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/neselunolefatanofumuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/valley_apparitions_memo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7577/files/solar_air_conditioning_and_refrigeration.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/29747794250.pdf
    • https://static.usrfiles.com/ugd/4c3ae3_6700e85d518d45a3850213c15c40e01d.pdf
    • https://static.usrfiles.com/ugd/b96e41_a1742ee5cef1433aaee75390b538f6f4.pdf
    • https://static.usrfiles.com/ugd/086daf_ab4a4d9c4c0d4fc19b9de0db3a561fc3.pdf
    • https://static.usrfiles.com/ugd/8a9bcc_d5558aaebb164e699d77042b18cfcf66.pdf
    • https://static.usrfiles.com/ugd/37428b_acf7878df926488d90bfbf358d2e0779.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_off00008947.bin
5a8e5912d4db214c38a066abd77c91f74330d9964579f4dda0c09f31a73d179f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8947 5592 bytes
font_01_sfnt_off00009c17.bin
4561cf3bfc1a1ac442be9c86f65f9440142d87753903320605cbdc13ff5b8b48
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C17 10544 bytes