Malicious PDF — malware analysis report

Static analysis result for SHA-256 084edb9f4fcbd695…

MALICIOUS

PDF

62.1 KB Created: 2020-08-13 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375afee14cbba62bccf9d975234074aa SHA-1: ded251f7934d2913e4db8e3a86cf480fe17580a8 SHA-256: 084edb9f4fcbd695c902460b80b59e8a449d9fa8d7101c98ee6b5f102cf7ef6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=hookah+bar+dj+appu+song'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the same redirector URL, suggesting an attempt to disguise malicious links within seemingly innocuous 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=hookah+bar+dj+appu+song
    • http://files.craicandcultur.com/uploads/1/3/1/6/131637150/dawada.pdf
    • http://dabivevut.juliabuntaine.com/uploads/1/3/2/3/132302942/7783342.pdf
    • http://files.shiningjdairygoats.com/uploads/1/3/2/7/132740951/02fb06af91.pdf
    • http://files.albertatreatingchemicals.ca/uploads/1/3/1/4/131407552/538ad58e501c8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/sim_sity_3000_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/zalimexinilini.pdf
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/embroidery_designs_images_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/solvent_polarity_chart.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/bukimogifotanoxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/bujemuvagalepise.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/banivujasedoruxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/14863514259.pdf
    • https://cdn.shopify.com/s/files/1/0433/4760/7720/files/string_to_char_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/jaxewajitiwuwes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/tangerine_book_online.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000776b.bin
bf6ddc67ceed661bacef0174ff5a4581c0ffde1c3ae5418c1d3ca3bf427f60ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776B 5432 bytes
font_01_sfnt_off000089d3.bin
a4e27665dd57fb6df0ec7bb105339afcf1d288992dc73d77361bdc1e28bd3dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D3 8600 bytes
font_02_sfnt_off0000a50b.bin
8ef4c9dbbd80d8ab240d47de33ef5684576a761dd2fa4c932cfda55227e7c8ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50B 15784 bytes
font_03_sfnt_off0000d63a.bin
3ec594ff7140c122a7483d9586eb1792a702c3abc554374ddaac990b0ecb148f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 5324 bytes

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