Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5c60f28a6f57fd…

MALICIOUS

PDF

36.5 KB Created: 2020-08-19 00:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360f35ef986ec43c48e0f57e1b0a63c2 SHA-1: 0c7656c055fab7d8d9f70b88d8a5e021ebbb48fb SHA-256: 3f5c60f28a6f57fd17bc5ab813179ae76ef680827b1f73cb6d06cbd05d81c251
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a dictionary and the malicious URL. This suggests the PDF is designed to trick users into clicking the malicious link, which likely leads to a phishing page or malware download. No scripts were extracted from this sample.

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=cambridge+english+pronouncing+dictionary
    • http://files.ennisexterminating.com/uploads/1/3/1/0/131070374/gozusoletajatijimo.pdf
    • http://jaxelekon.autotechccc.com/uploads/1/3/0/7/130739625/ca9add.pdf
    • http://files.aloeveraseatery.com/uploads/1/3/0/7/130775429/1391905.pdf
    • http://files.dawghouses.net/uploads/1/3/0/7/130739238/6f35e03ad255.pdf
    • https://cdn.shopify.com/s/files/1/0436/7941/6473/files/webegakusalidabopefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/85768564306.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/magamikiromuzas.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/zapug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/nebavow.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3387/files/91872752792.pdf
    • https://cdn.shopify.com/s/files/1/0437/7572/1633/files/6539640055.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/7488062599.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/39785118510.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/rexegebibavamavawaxabim.pdf
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/espresso_english_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/osrs_p2p_magic_training.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/38760081658.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dd2.bin
b2769b8b28da4e96e9eae824575d49deb6c2180b8615f12fe8568417fb129ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD2 5632 bytes
font_01_sfnt_off000060cc.bin
a508c601fdfdfa91be2175f8b271a953fd72fadda7bcd094b9b36f0a981fc939
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CC 10680 bytes