Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b28e0437c3ef6f…

MALICIOUS

PDF

48.9 KB Created: 2020-08-15 16:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07bcfc1f9098588f9c2a479518d9f1d7 SHA-1: c9772c8b41f0bf6b0d82d24156eddaf7cd8d23d6 SHA-256: b3b28e0437c3ef6f3a2c82d4ea9959c3858116fc0ffd84775e31103b347172fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'deductive and inductive research pdf' and the malicious URL. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent. The primary malicious IOC is the redirector URL which likely leads to further stages of the attack.

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=deductive+and+inductive+research+pdf
    • http://xepar.pamelapalmadesigns.com/uploads/1/3/1/4/131482952/c14b60b2039.pdf
    • http://rixux.jackiekillian.com/uploads/1/3/0/9/130969130/dd7edfebb6be40.pdf
    • http://kapulevi.structure-productions.com/uploads/1/3/0/7/130776485/2154578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0443/8127/4278/files/sanibel_island_tide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/bovimavogalobaxavaxabakom.pdf
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/python_script_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/rozalalogafefebov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/51187815900.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/nakeridova.pdf
    • https://cdn.shopify.com/s/files/1/0430/3064/2837/files/49748172009.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/dejefujafodefuxerubowomur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotalufakelani.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_off000074be.bin
026a000a5f511950ade0af3865bfaef5230c25f698fe7aeebe1c481b3b19b8ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 5040 bytes
font_01_sfnt_off000085da.bin
a0f2a55b4066c14d5924da532b509f57a31ab4ee5a5ee476d299549099775fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x85DA 10204 bytes
font_02_sfnt_off0000a8b5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B5 4324 bytes