Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e429376eab5da11…

MALICIOUS

PDF

46.4 KB Created: 2020-07-22 12:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81c1db940a3bc5ef0c621d9dc68b3a9 SHA-1: 4ff0d7eb9aa05f5af9bcdae28354859ad419a10f SHA-256: 1e429376eab5da1111c175888e59c3b36ac1ed213801026b1fc31220464e66e4
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious sites, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is ttraff.com, which is used in conjunction with a search-like query. The document body, though heavily obfuscated, appears to be a lure related to 'teachers day speech in assamese language pdf'. 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.com/pify?keyword=teachers+day+speech+in+assamese+language+pdf
    • http://files.briankerr3d.com/uploads/1/3/2/7/132710592/508c6.pdf
    • http://files.dianeetatumwriter.com/uploads/1/3/2/6/132680976/pavopudimigubopewimi.pdf
    • http://files.ablackrose.org/uploads/1/3/1/4/131452799/jerudamama.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/femepotufitaxaturu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/53053774865.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/vizuzajisejukuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2402/files/7277778621.pdf
    • https://tazotezevol.files.wordpress.com/2020/07/fulepefik.pdf
    • https://juraxub.files.wordpress.com/2020/07/15263303871.pdf
    • https://dapufilakode.files.wordpress.com/2020/07/pibevapusabobuwomoterut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58585016777.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/duluxekufojowigewaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/tudabosawarogedoduzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/dizamudipani.pdf
    • https://cdn.shopify.com/s/files/1/0434/5790/4792/files/71420317863.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/81190174188.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0033/files/zowulivavutuxewazis.pdf
    • https://cdn.shopify.com/s/files/1/0428/4458/6140/files/79421290094.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_off000078a3.bin
ba7e0c1c7c06e35173f2fffcc480358614dc6a664c3e972986ad4455dc3b3727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 5312 bytes
font_01_sfnt_off00008a85.bin
21368bb00ee614fc2ea61f6e5f65bc41b3594712a364cdc9fefeb01bcd59aeac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A85 9740 bytes

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