Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2703017e61240b0…

MALICIOUS

PDF

44.8 KB Created: 2020-09-05 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186aeadbca81ed58b7a1d27323dc7f7b SHA-1: 58b0312e3207996932c6827d2581530c49eaf0a1 SHA-256: b2703017e61240b0633db41ff453a8cf77dc3cab46ea5beed47d4c5db2b71421
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to fonts and URLs, reinforcing the lure. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution 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.link/pify?keyword=calligrapher+regular+font+free
    • https://static.usrfiles.com/ugd/44b221_9d5b4217959b4679936468ae494d5cf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f7a7240fc547119f6dc051bed9310f.pdf
    • https://static.usrfiles.com/ugd/5b9365_9cdc1e6f47124dc792c7c53171470de6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab8d139f16d40d2aa89387052243d87.pdf
    • https://static.usrfiles.com/ugd/078c79_1d3ce11a47de465f86f9d142d7b7c0bd.pdf
    • https://static.usrfiles.com/ugd/debbe1_573241cb87e94598b1bb73dd670a11f5.pdf
    • https://static.usrfiles.com/ugd/6116da_93d935d6596949de96801ca30613a204.pdf
    • https://static.usrfiles.com/ugd/b8c837_26b58eef2d594002986b9e92037c8a4b.pdf
    • https://static.usrfiles.com/ugd/105a8c_73c6752e9ce0460186da5db2b6400811.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/97882953167.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/possessive_apostrophe_s_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/46104905320.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c99.bin
a598c1e05640b14e4834839063204b3071d502099b20cbe662fadb0f6133cf27
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C99 4892 bytes
font_01_sfnt_off00005d3e.bin
d914178ebb3d0fe0118705f74c3b15e4093f8af9791cd9a58801f5e122336047
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 18924 bytes
font_02_sfnt_off00009857.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9857 4324 bytes