Malicious PDF — malware analysis report

Static analysis result for SHA-256 588d603bc332258d…

MALICIOUS

PDF

56.5 KB Created: 2020-09-02 09:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc06f99d16af1eaa011377ef9dcf907a SHA-1: 5a48da3388801989062d59f28ff0d1a2f03f85db SHA-256: 588d603bc332258d1038a56d4f56cdb81a23ecf606c40e86e505cc1cb30337f6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.me/wix?keyword=i+miss+you+in+korean+formal. Additionally, another critical heuristic indicates a PDF link farm, with numerous external links, many pointing to Shopify domains. The document body contains the phrase 'I miss you in korean formal' and the malicious URL, suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=i+miss+you+in+korean+formal
    • https://static.usrfiles.com/ugd/04e6f9_9c398be27d614f5cad89a045590688fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc64a79bd1e343d5a31e14258736a2f3.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_8beef3f51ae2411cbb44d68e2b3b5000.pdf
    • https://static.usrfiles.com/ugd/3cb679_adffb9e242174e00b10553855d269788.pdf
    • https://static.usrfiles.com/ugd/35ddae_7d1ae5fef24348e2b3846c181f121606.pdf
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/94355782853.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2245/files/the_good_witch_tv_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/47332833196.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/10058542244.pdf
    • https://cdn.shopify.com/s/files/1/0440/8462/5558/files/achilles_last_stand_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/pamipoxusapetefekodepog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8601/1813/files/fm_21-_76.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/l_apiculture_pour_tous.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/27029747895.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7757/files/rupazenuladifem.pdf
    • https://cdn.shopify.com/s/files/1/0464/5784/7976/files/14450655072.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/zogabazajezeja.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_off00007788.bin
516a3f35ebf388b39fbb66e6d989746c7cd8bb1cacbe1a82138d6e26410ef5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 13132 bytes
font_01_sfnt_off00009fab.bin
b1620b91eb12570d09fb6075d122d8b3e521b12797eed48d1b0bd90d577b6440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAB 5016 bytes
font_02_sfnt_off0000b0ae.bin
62739072e8bfaca45ad28de50c5fa14d87050c69ed1085754766c2ba51538ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 10120 bytes

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