Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0845d29c3b5815…

MALICIOUS

PDF

49.1 KB Created: 2020-08-03 03:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b8030091d3181395024f63f8b3541a SHA-1: a156049a2fa81b8f6b12a3cf05f916495adce05d SHA-256: 7e0845d29c3b5815bfc8123daf2cf4e46046978fc4edd19530719b2e715ccb09
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The primary malicious URL, https://ttraff.com/pify?keyword=%25D1%2581%25D0%25BE%25D0%25B2%25D0%25BC%25D0%25B5%25D1%2581%25D1%2582%25D0%25B8%25D0%25BC%25D0%25BE%25D1%2581%25D1%2582%25D1%258C+%25D0%25BF%25D0%25BE+%25D0%25B4%25D0%25B0%25D1%2582%25D0%25B5+%25D1%2580%25D0%25BE%25D0%25B6%25D0%25B4%25D0%25B5%25D0%25BD%25D0%25B8%25D1%258F, is likely used to redirect users to a malicious site. The presence of numerous other PDF links, many hosted on cdn.shopify.com, suggests a link farm used to obscure the true destination or for SEO poisoning. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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=%25D1%2581%25D0%25BE%25D0%25B2%25D0%25BC%25D0%25B5%25D1%2581%25D1%2582%25D0%25B8%25D0%25BC%25D0%25BE%25D1%2581%25D1%2582%25D1%258C+%25D0%25BF%25D0%25BE+%25D0%25B4%25D0%25B0%25D1%2582%25D0%25B5+%25D1%2580%25D0%25BE%25D0%25B6%25D0%25B4%25D0%25B5%25D0%25BD%25D0%25B8%25D1%258F
    • http://files.socalis.org/uploads/1/3/1/6/131637150/5681287.pdf
    • http://files.jrcnboergoats.net/uploads/1/3/2/6/132681144/xowarigajezidi.pdf
    • http://files.milkywayenglishretrievers.com/uploads/1/3/1/1/131163836/botavedajovosom-dovedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9680354999.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/wunefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/23419171127.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/zapeloduwonujon.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/tamasha_full_movie_online_watch.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/36445128841.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/20267173466.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6572/files/sublime_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/babylock_imagine_serger.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/14844211440.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/87916376752.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/vitual_hottie_2.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_off000075a4.bin
853624f2dc645145ff37a16f7545b4cf76110d8c709e6a4969921e924bb26e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A4 5724 bytes
font_01_sfnt_off0000886b.bin
10ab99308b9d57019fa7962f384e9db89f0181bd42a8203258768e4a8c820e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886B 13848 bytes

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