Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a812b4c9513e3f…

MALICIOUS

PDF

53.2 KB Created: 2020-08-16 19:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b786bedde6b73d48c4eb0e4379f59029 SHA-1: 1cbec7b0d7d4ba3340a95c4d131be13691bd565c SHA-256: 77a812b4c9513e3fbce5da58676002601c550e2aa3ce6a348b5cf907607d5818
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=apache+server+etag+header+information+disclosure+tenable
    • http://files.audreyaliwarga.com/uploads/1/3/2/8/132814990/mapefe.pdf
    • http://files.bethelroyalheirs.com/uploads/1/3/0/8/130874143/7727158.pdf
    • http://files.mhfirstresponse.org/uploads/1/3/0/9/130969377/xegepobavilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/rodaxobumofikutewufutiga.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/66884554368.pdf
    • https://cdn.shopify.com/s/files/1/0431/0519/0041/files/comment_fusionner_2_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/convert_html_to_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/84025918114.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/kiniru.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/janariru.pdf
    • https://cdn.shopify.com/s/files/1/0438/1445/3410/files/46482924885.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/dalafa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e23.bin
188a32abc5f0880e9b46440012ef1fc86bdea91aafd8076ff30e4d6da993b85a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E23 5640 bytes
font_01_sfnt_off00008115.bin
1ccfdb965ac1c7a735855f6c27e3edda1425c3432a388fdbc3eb9e884b12240a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8115 2004 bytes
font_02_sfnt_off00008aac.bin
76cdb4792e5b4f0446fd10510168f6c7e9745abd2c9c63db6f29072b55f525a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAC 14876 bytes
font_03_sfnt_off0000b8c1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 4324 bytes