Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc9702daba98138…

MALICIOUS

PDF

52.4 KB Created: 2020-08-15 06:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04a5b457ff00d256025eb19a8123f98 SHA-1: 723c3e75c29e445747e9158eed9bd9e90411e489 SHA-256: 3dc9702daba98138b9248e9c0af13b5f44626420ecbb33df63fce2ef45a8ad69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=twin+platform+bed+with+drawers+solid+wood'. Another critical heuristic identified a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious redirector links and the link farm structure strongly suggest a phishing or SEO poisoning attack pattern.

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.ru/pify?keyword=twin+platform+bed+with+drawers+solid+wood
    • http://files.fashionbysitaramysore.com/uploads/1/3/0/8/130813736/detufigagume.pdf
    • http://files.lrcstageproductions.com/uploads/1/3/0/7/130775021/6281635.pdf
    • http://tetama.britaliaway.com/uploads/1/3/0/9/130969723/9352217.pdf
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/black_and_blue_wallpapers_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/29252904769.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/91844829359.pdf
    • https://cdn.shopify.com/s/files/1/0434/8195/6518/files/saint_augustine_of_hippo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9753/files/fisafivigakizotidiminus.pdf
    • https://cdn.shopify.com/s/files/1/0449/2158/5831/files/klasifikasi_tanaman_asoka.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1626/files/voxawerigosakinagezote.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/16634522590.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0436/3508/1374/files/56307003374.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/34043788022.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/batch_convert_word_to_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/lofopedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/3rd_grade_math_practice_workbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000773a.bin
f89a5e1577af212ed77b86560b55f4881b8a72cd1a6f0ec7b844f7faea850d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773A 5460 bytes
font_01_sfnt_off000089a2.bin
10d5da1607f2160b9904be862c28e9bfa11d98e2d8956b7d922410c95b31efff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A2 10236 bytes
font_02_sfnt_off0000ace9.bin
e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACE9 16168 bytes

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