Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9989ebfa8efbd6a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-08 04:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 335be3e8701cd127e72667a36de1eec5 SHA-1: 401062350eb99529b99754cc3b63a587faada6ca SHA-256: f9989ebfa8efbd6af3705aee03f4800372bdac29f7abcb5003c22b8823a2f332
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'area compound shapes worksheet answer key pdf' and includes the malicious URL. This suggests the document is designed to trick users into visiting malicious sites under the guise of educational content.

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.cc/pify?keyword=area+compound+shapes+worksheet+answer+key+pdf
    • http://dexugeku.habiology.org/uploads/1/3/2/3/132302780/nesozuwidutaxawonidi.pdf
    • http://files.designsbydiblankets.com/uploads/1/3/1/4/131407274/moxira_jupira_purufurofoguro_vivasapaf.pdf
    • http://files.nyingma-summer-seminar.org/uploads/1/3/2/7/132710784/delamu.pdf
    • http://pudere.nyuasap.org/uploads/1/3/1/4/131406149/vurejofodulurenuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/moxivosewaduv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/fenepatifunimumoxupoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2047/files/71619769841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0439/3651/4216/files/bank_of_baroda_net_banking_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/litusapodiku.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/mageze.pdf
    • https://cdn.shopify.com/s/files/1/0436/8593/7307/files/9380207968.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/alcoro_baixar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/64307243323.pdf
    • https://cdn.shopify.com/s/files/1/0440/7905/5000/files/make_room_casting_crowns_chords.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6982/files/w-_9_for_nonprofit.pdf
    • https://cdn.shopify.com/s/files/1/0436/8292/2646/files/85916238280.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/12802178731.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_off00006570.bin
96fb7f1235a596421f69fea45f2465a5de08bdfa7840727b6e3ff22bdff4aaef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5612 bytes
font_01_sfnt_off00007871.bin
8d99111c134cf0785f22d780d09c898e3df00b523caf98d01fc21a7ac6a483f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7871 10996 bytes

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