Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ec2bb7e4483e93…

MALICIOUS

PDF

75.2 KB Created: 2020-08-12 06:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101f775efcaa03d6fc44cb3ddbf30f4d SHA-1: 4fbd3ffe79245fd21151fe5e6a34a89cdd273b48 SHA-256: a3ec2bb7e4483e931d83027ac411d5e85147343ecc39cdc0fac214b1fec483dc
152 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/pify?keyword=fyodor+dostoevsky+brothers+karamazov+pdf'. This indicates a likely phishing or malware distribution attempt. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=fyodor+dostoevsky+brothers+karamazov+pdf
    • http://mofipag.unintentionaladdict.com/uploads/1/3/1/6/131636612/gasetodojixo.pdf
    • http://files.nem-massage.com/uploads/1/3/1/3/131398507/kimaraku.pdf
    • http://files.nutritionbythesea.com/uploads/1/3/0/7/130775393/385328.pdf
    • http://files.cheffurdell.com/uploads/1/3/1/1/131164417/webabewin.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/18571265864.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/fepureze.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/48968513431.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/32316835440.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/26317907007.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6334/files/gixabigobi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/1299653807.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1904/files/kilazeg.pdf
    • https://cdn.shopify.com/s/files/1/0450/1697/3476/files/collocation_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/882054269.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/
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/1299653807

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7db.bin
122d576b5fd98b34efb9475e54eec0721d014b7aed9e6f3da9ae0bfe3cb1af7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 5620 bytes
font_01_sfnt_off0000faec.bin
36efd74f56fd726fc4e9737a3bb74ea2226d8940bb90f0f017986f4d4bc1eb12
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10776 bytes