Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6aed81109f1a96…

MALICIOUS

PDF

55.7 KB Created: 2020-08-10 00:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61ed3b746c01f6b2d3459472a4e1e4c SHA-1: 808442e20ed3999d6b9eeea8842b649786a964c0 SHA-256: 8b6aed81109f1a960526c2b81084006168db5a041802dfb0d213a05d7319fcac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Override T1059.001 PowerShell

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The primary malicious link is https://ttraff.com/pify?keyword=maintenance+manager+interview+questions+and+answers+pdf, which is designed to lure users into clicking by disguising itself as interview questions. The ML classifier strongly supports the malicious nature of this PDF.

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=maintenance+manager+interview+questions+and+answers+pdf
    • http://files.donjenkinsjewelers.com/uploads/1/3/1/4/131453535/254469.pdf
    • http://files.ozarkmountainprayerbreakfast.com/uploads/1/3/1/4/131437532/wupalowomuwifizub.pdf
    • http://files.thursdayschildsailing.com/uploads/1/3/1/6/131636807/kulex_tevupixumepig_tigode_pikagamijimitim.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/88797050114.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/burkert_solenoid_valve_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/speech_writing_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/vakit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/pejobixudazi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/35702372202.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/dipofefobil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/alimentacion_consciente_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/electronic_devices_and_circuits_by_allen_mottershead.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/pdf_to_word_converter_paid_apk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000719f.bin
30b052b5af0016b8705604bb92149a05d712116a0e1b6f4650a0353887caed71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719F 5728 bytes
font_01_sfnt_off0000851b.bin
058e486163ee8366f953b4d31bb4d4af218342d04fb1ee889e90f721afcb3075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x851B 4652 bytes
font_02_sfnt_off000096f0.bin
dadcee8d1b552b409a85e9b1e69433e586b7b6bac7779fcc699cd3c77ccced8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F0 10772 bytes
font_03_sfnt_off0000bba8.bin
b138d3e09a3de7d40c951d1cc7efbdf58cdda7284ff8736a4554d575500dbdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA8 16208 bytes

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