Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7249e871a99b53e…

MALICIOUS

PDF

51.3 KB Created: 2020-08-07 06:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b90269602a9a66e9ce7a2fb94c734c9 SHA-1: 040a380dade64ecfb120344493c0ac27719c9853 SHA-256: d7249e871a99b53edea6d25d6f2f28f7c5b1e78c8fb710cd09c6485fc4f1692a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to direct users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=systems+approaches+to+management+michael+c+jackson+pdf
    • http://files.graceinwellsville.com/uploads/1/3/0/7/130775666/savomujadewufasexo.pdf
    • http://files.redfishcottages.com/uploads/1/3/1/4/131483337/xugefur-xofejariba-raziv-kowajo.pdf
    • http://gabusod.sasquatchsyndicate.com/uploads/1/3/1/0/131070792/vufavadizojiwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/2341907699.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/13989089636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3105/files/rabies_encephalitis.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/alabama_abortion_law_details.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/nomotanijeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/risk_factors_of_type_1_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/68406782314.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/28967512060.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/74804115710.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/xaritaloka.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_off00005f9a.bin
0ee7646d307780b1f82a70fb3b0fe0ae8efa86fc967d6f6436b175bcf12eb670
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9A 5916 bytes
font_01_sfnt_off000073a0.bin
00edfea6c91cdf3fc9928b43b92fa11b3e92e5c84e9c73da3c81c07e315762d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 14252 bytes
font_02_sfnt_off0000a113.bin
2ce4122bedd6101450cfc33e21501f48ed817cfb3228c92ccb5a1733f8fa063b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA113 18976 bytes