Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039bb28cac397ad…

MALICIOUS

PDF

55.2 KB Created: 2020-08-04 04:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cc8ed293832b59f3902423ffa46ad14 SHA-1: 79e53e8ba8005292304396dc688093ddf36b819e SHA-256: 1039bb28cac397ad5d5f3168fcab264a6e15fda95eb90a9e76297a4a9ed61f35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a medical terminology PDF. The ML classifier strongly indicated maliciousness. The embedded URLs suggest an attempt to drive traffic to potentially malicious content, likely for phishing or malware distribution.

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=medical+terminology+abbreviations+pdf
    • http://files.wisteriasage.com/uploads/1/3/1/1/131163718/c599b09f19a7e.pdf
    • http://files.blancplume.com/uploads/1/3/0/7/130776175/66fd80.pdf
    • http://files.stamfordstrings.co.uk/uploads/1/3/2/6/132682868/wotibuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/lexevujobutijuxivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/web-_config_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/8502453416.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/47318635525.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/netusar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/sokufemerojigenedibesam.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/kitebuxarasoke.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/epson_xp_640_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/59071604255.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d01.bin
55d1391bf98c365a14e119b80314f35dd24748af1dce27763aa4e62f0e4832af
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D01 5780 bytes
font_01_sfnt_off0000a0b0.bin
33ab7641951d0c28efd57b0c36ca653f78f56853a891dbe6f2926541eacf8c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B0 15344 bytes