Malicious PDF — malware analysis report

Static analysis result for SHA-256 9210c3e03caaa248…

MALICIOUS

PDF

44.5 KB Created: 2020-08-06 15:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d684708e9eac05a4a4d05aa95adbe19a SHA-1: 771007fe350b83f493f8cfe44e8c43e9bdf3445d SHA-256: 9210c3e03caaa248e6915364e7ec057124471e52d8641b0a5ecd297a48f92800
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link redirecting to a known malicious domain. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains the primary malicious URL, indicating its intent is to drive traffic to that redirector.

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=difference+between+verbal+and+non+verbal+communication+pdf
    • http://xogobufip.memberoftwotribes.com/uploads/1/3/1/4/131411896/zivenux_belifufetibo_toguxir.pdf
    • http://files.kirkbeeler.com/uploads/1/3/1/3/131381706/zevalisigo.pdf
    • http://files.outstandinglibrarian.org/uploads/1/3/1/6/131636914/gazugus_zugokezinu_bapegusonulog.pdf
    • http://files.mrssheltonfacs.org/uploads/1/3/2/8/132816096/rutuxoxidofujilip.pdf
    • http://files.radmanusa.com/uploads/1/3/1/4/131482976/janununan.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/50724401592.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/zalama.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/1084111763.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/umbilical_cord_blood_banking.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/botegixekapawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/kobabukeveva.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/miligajawesidegatorufal.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/38724769976.pdf
    • https://cdn.shopify.com/s/files/1/0437/3289/3857/files/top_100_anime_movies.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/neduru.pdf
    • https://cdn.shopify.com/s/files/1/0439/0364/7912/files/set_timer_for_14_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/12593261719.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/universal_remote_codes_for_toshiba_tv.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_off00007027.bin
e254b509c30772a4034342400099c61e789beb5244e8e4b9fd14b620d7f2cf44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7027 5412 bytes
font_01_sfnt_off00008297.bin
24e6b424cf5b80e0570727363eaaf4ed612cec5bc15432c803b121a59a821a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 10008 bytes

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