Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad686f29f50916f…

MALICIOUS

PDF

69.8 KB Created: 2020-08-22 03:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2732f430cc85856e7325bfdc3eea8c97 SHA-1: 73a2de4e3f948fa46fb2a7f58adb4bd3efabdcf4 SHA-256: 2ad686f29f50916f376e5a7ad41c4c8a4331d6d6a6bb0112f4436b336d7f5dd4
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Lineare bruchgleichungen aufgaben pdf' and the malicious URL, suggesting a lure to a scam or phishing page. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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=lineare+bruchgleichungen+aufgaben+pdf
    • http://bepurima.madrivergarlicgrowers.com/uploads/1/3/2/3/132302978/6605232.pdf
    • http://famanani.kelsrodreel.com/uploads/1/3/0/8/130815017/worikixaxepizuf.pdf
    • http://files.exitrealtyeastpm.com/uploads/1/3/0/7/130776049/3196014.pdf
    • http://files.eaglerivermassage.com/uploads/1/3/2/6/132681409/kekolebafojagar-vupugaxezajemo-xojefineviv-rerun.pdf
    • https://cdn.shopify.com/s/files/1/0448/2197/1104/files/learn_arabic_language_through_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5160/6435/files/fepewiwimusikopupem.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4135/files/simple_present_past_and_future_tense_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/time_value_of_money_all_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/banjara_whatsapp_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/xogaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/facebook_messenger_lite_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/conjunctive_adverbs_list_and_their_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/doxasamu.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/linen_bed_sheets_king.pdf
    • https://cdn.shopify.com/s/files/1/0439/6112/2974/files/internal_audit_strategic_plan.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_off0000b0f5.bin
fb9be39db9ea0c30a20e5182a1ab6a9b1f2c0dbcb21946f89df76f7acc33e51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 5320 bytes
font_01_sfnt_off0000c2fe.bin
ccdf9c3f5dae338168451b90a5efd07759a727f3a0ffa9f4b2ea59d454af09cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 16340 bytes
font_02_sfnt_off0000f49c.bin
fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16144 bytes

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