Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb832087e0d06cc8…

MALICIOUS

PDF

43.3 KB Created: 2020-08-11 05:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d297983771cd2469b80429ffaebc442b SHA-1: 0c2e14bceb2f0b5d05fa44fe1e47d9d1ff947348 SHA-256: fb832087e0d06cc822a7e96d629739fe9165b9e129cdcf9aed22c6030adab43d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

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 the text 'Vocabulary words test with answers pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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=vocabulary+words+test+with+answers+pdf
    • http://vamal.nanettelelaulu.com/uploads/1/3/0/9/130969352/baromexowe-tibopiser-nonulekizijupu.pdf
    • http://xojeroj.privateinvestigatorsdubai.com/uploads/1/3/0/8/130814535/gepubipusuku_puluxis_pimujozi_fafoxak.pdf
    • http://files.healthandbeautycare.shop/uploads/1/3/0/7/130739376/tudebigare.pdf
    • http://galov.srphotographymelbourne.com.au/uploads/1/3/1/6/131606339/8926999.pdf
    • http://files.jaggeredge.net/uploads/1/3/2/8/132814272/zopefuzajap_sipukapen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/tulitubojejetibiguzitof.pdf
    • https://cdn.shopify.com/s/files/1/0434/7419/0498/files/saxakurasasevexizun.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/gamixojuvuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0436/2685/6610/files/lomerovaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/pemubotixitinivotem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/zisafo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/tukowizubunixebiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/cancel_creative_cloud.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/77758079626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0435/8415/9903/files/rafewisigasoguk.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_off00006781.bin
8e927cd3efc7a0bd955c2368cb667f69a4229ca46501f396dc221b18e5101d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 5544 bytes
font_01_sfnt_off00007a5d.bin
233373058e6fec7b53dcb35898fbb25fff448c847e801cec9c6063a52fee5baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5D 11332 bytes

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