Malicious PDF — malware analysis report

Static analysis result for SHA-256 19100cd4d22a2540…

MALICIOUS

PDF

54.0 KB Created: 2020-08-02 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e11f4854c331ed08566db2d885f214fe SHA-1: 216a0352279b5b794d2f558feaced4caf9982bfe SHA-256: 19100cd4d22a2540d0e051240a1ab653320da93a56a956d4b818493e8831a217
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm designed to lure users to malicious sites, potentially 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=git+no+such+remote+origin
    • http://files.hyojinlee.com/uploads/1/3/2/7/132712614/553efc51b3f.pdf
    • http://files.paintingoz.com/uploads/1/3/1/4/131437669/pakopiwedexuwemazo.pdf
    • http://files.mrdaviesmusicclass.org/uploads/1/3/0/7/130776602/zovajedijevutopuse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/deborizixemalovipibokez.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/zajirazetegaxalobites.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/fiwugefujuzutowazijugota.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/17717995948.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/lekuxude.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/xuperinuvetotagiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/xigujadipudi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3478/5430/files/gudik.pdf
    • https://cdn.shopify.com/s/files/1/0436/7073/2950/files/kiwuvepagedeja.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/92988459425.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/watch_roadies_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/84958183393.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_off00006475.bin
62b96125e8af9359f2a16a146a95071cfa5b9de3982b338f11eaf732f1eda1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 7944 bytes
font_01_sfnt_off00007f05.bin
8d1b37b32406cd2485becff9f8fa6a9317a14ce3109fa6274bd51d6b08049c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F05 4884 bytes
font_02_sfnt_off00008f78.bin
0413110adac3a82bde5bd19d0a48bbdf547ba79700cb695807f7985f1d7a7760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F78 13340 bytes
font_03_sfnt_off0000ba42.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 4324 bytes

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