Malicious PDF — malware analysis report

Static analysis result for SHA-256 805bd190d038bf2d…

MALICIOUS

PDF

53.5 KB Created: 2020-08-03 19:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3307073017b3f6efa3ca5c6d3d4c4fd SHA-1: 9ccbf51ab60f24c5927ccb9a004149f31d36c5b1 SHA-256: 805bd190d038bf2d0ddd3656a968d95af673561bde5061088465a8b05453b789
162 Risk Score

Malware Insights

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

The PDF contains a deceptive call-to-action disguised as a merit list download, which upon clicking, redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including a redirector, supports a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs and the nature of the document body suggest a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=ap+grama+sachivalayam+merit+list+pdf+download
    • http://files.inrhispantry.com/uploads/1/3/1/3/131383318/9507749.pdf
    • http://files.allforonefoundation.org/uploads/1/3/0/7/130740609/4367385.pdf
    • http://files.pamelapretty.com/uploads/1/3/0/8/130813095/togav.pdf
    • http://files.starsandstripesunlimited.com/uploads/1/3/1/3/131379189/8194672.pdf
    • http://files.stevenjayclarke.com/uploads/1/3/1/4/131482931/31837212141837.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/sojaraxavigulijadazi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/57741790400.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/valelufotosut.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/gejusozasobisusenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9137/8854/files/59209175197.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/43555781427.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sikotifukiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/xirasexitabeluvupuseruk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/10889148057.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/toridobuzoweluwifu.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_off0000682a.bin
93790e3a553db288e397eb05c09219b31c47eda3ad2e0ee60d28b789c8f50a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 5600 bytes
font_01_sfnt_off00007b2c.bin
667f50b0e0cf8db3dc2e41911ed49627c7119bfd4a97845ef07bf9f11edd40d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2C 10380 bytes
font_02_sfnt_off00009e5b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5B 4324 bytes
font_03_sfnt_off0000ac5b.bin
3d9b478d40af7394eca7490dedda9b63944ddb76c2858a58cb10ed98a0ef7db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5B 8076 bytes

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