Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b0293627cfbf87…

MALICIOUS

PDF

55.2 KB Created: 2020-08-08 10:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40244b9f8be46a540a1a5f0ce730e4e0 SHA-1: d8c795aa10bd69846adb536d377be111e5352748 SHA-256: 05b0293627cfbf87f3ff3106fc1a4c096e8ed94f480f8c18493b4f5f45c09231
194 Risk Score

Malware Insights

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

The PDF contains a lure related to programming questions, but the embedded link redirects to malicious infrastructure. The heuristic SE_ADVANCE_FEE_SCAM_LURE suggests a broader scam context, and the PDF_SEO_LINK_FARM heuristic indicates the document is part of a link farm designed to manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs point to a malicious intent to redirect users to harmful content.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.ru/pify?keyword=java+programming+objective+type+questions+and+answers+pdf
    • http://files.ask-noodles.com/uploads/1/3/1/3/131398573/jikibapuseso.pdf
    • http://files.shopdelmarcielle.com/uploads/1/3/0/7/130738572/zapepa_zejola_gimisuralu.pdf
    • http://files.spicelandtown.org/uploads/1/3/0/7/130775746/fotisivupimi_wuzuder_rixama_bedixuwoza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/angularjs_reader.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/34997710873.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/dilefopej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56697352128.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/nasegexura.pdf
    • https://cdn.shopify.com/s/files/1/0438/7382/9032/files/dark_souls_2_victors_stone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/nathalie_sarraute_tropismes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/tomorrow_lyrics_annie.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/hollander_interchange_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/xomokex.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/57665480256.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000856b.bin
ceb45948b594d90d24b3c0bd758718029d7a83bc046a8c6df230ad31d11df447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856B 5912 bytes
font_01_sfnt_off00009980.bin
0078b9117b5ceef9134da32725c04344d3afe04daee0987d4f6a47cbcafac235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9980 12024 bytes
font_02_sfnt_off0000c0dc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DC 4324 bytes

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