Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e541494be0d769…

MALICIOUS

PDF

48.2 KB Created: 2020-07-31 05:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c959b79f17e94982494f8ed3143f91e SHA-1: 71c389f3f584ff8f51e8b14ba152493d639b300b SHA-256: 76e541494be0d769841fe4ecca50f4215b70e52ed640f45715487804099a1810
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain text related to guitar lessons, likely serving as a lure. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=5+canciones+faciles+para+guitarra+pdf
    • http://files.thornappleplayers.org/uploads/1/3/2/6/132696506/5229272.pdf
    • http://files.flametreemalawi.com/uploads/1/3/2/6/132680932/denekipote.pdf
    • http://files.longbeachjunkremoval.org/uploads/1/3/0/7/130740504/751102.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/12088304632.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/kosupajakikixusesep.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/bivakede.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/16861162882.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/madulufapijedajetanixak.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/jovapaberusupikomokamira.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/rulixaxenojufugomosafura.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/78513994524.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/jifiwuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/83349555925.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/runone.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_off0000724d.bin
a13f777d69a8d0514413a274409526fd4cdd5155e5a1a3809a960b03f5add714
pdf-font-stream PDF embedded font (sfnt) at offset 0x724D 5236 bytes
font_01_sfnt_off00008411.bin
7ef6cb6698fea806eec66effba9ae77859a8e18c03169e66e212b1421c87ab72
pdf-font-stream PDF embedded font (sfnt) at offset 0x8411 1888 bytes
font_02_sfnt_off00008d24.bin
cf5a10f65c41ef812cf35fb003fe35fe05c331886e9eff1f82ebf3a6c8a6f058
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D24 11144 bytes