Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ada90947c6dc1c…

MALICIOUS

PDF

34.7 KB Created: 2020-08-11 20:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c353e29cc1b77ae7066b90a4e110677 SHA-1: 471b55be4c7b965e5e9046933fe7a4cc019cb012 SHA-256: 08ada90947c6dc1c24db46db421f9ce802c8fc328436b77625a355abfb103c63
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic content, suggesting a phishing or scam attempt. 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.com/pify?keyword=anti+lock+braking+system+thesis+pdf
    • http://xexexig.ashevillemovingpros.com/uploads/1/3/0/8/130814328/7588559.pdf
    • http://files.lifebeforetheruins.com/uploads/1/3/1/8/131871633/napunawidisige_pujodid.pdf
    • http://files.crossborneotour.com/uploads/1/3/1/4/131453453/wokevubuda-jitowob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/gupakalogawijuximo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8810/1030/files/xutuzoperoxofofenub.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/wijerekerevufajenazasigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/clinical_examination_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/seedfolks_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/free_bass_guitar_chord_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/mimupiwipivoxave.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9814/files/81160748605.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/72965508377.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/piccadilly_line_timetable.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/76076745309.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/jotamobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/zujasagawoxizujuwi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049e5.bin
b2a56f6bfb634bacbb4a09b786bcef910d66e64cdfe3eeb7ebe50f3bd9a948df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E5 5864 bytes
font_01_sfnt_off00005dab.bin
77725ab70d91551f2c9cd54ad0ddde5ab6e5bf710587d7db419c25ef14777e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAB 9436 bytes

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