Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8223c3bf1606be…

MALICIOUS

PDF

45.5 KB Created: 2020-08-08 11:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13adb238c1550d49465bfc4444c1745f SHA-1: d958c8b0daee4d92775a56b3caf45a169f0d8b04 SHA-256: de8223c3bf1606be7b6cee5e9431ad214bde276608cea77062ed62592c28a96a
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a book download, but the primary link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the text 'Old man and the sea book pdf free download' and the malicious URL, reinforcing the lure. The presence of numerous benign-looking Shopify links is likely a tactic to obscure the malicious 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=old+man+and+the+sea+book+pdf+free+download
    • http://monemix.cathclip.com/uploads/1/3/1/4/131407406/e0a4a.pdf
    • http://files.simplelivingstrategies.com/uploads/1/3/1/4/131438008/suzanuw.pdf
    • http://files.smartrevivemobile.com/uploads/1/3/2/3/132303229/8755340.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/zurekunefuvexokopejef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/85629351447.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/bajaweputuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/diwalenagaditenefonik.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/touring_bicycle_buyer_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/sajononusi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/11731454481.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/wukisujavegef.pdf
    • https://cdn.shopify.com/s/files/1/0430/6812/9431/files/95487676914.pdf
    • https://cdn.shopify.com/s/files/1/0429/7903/3241/files/29499672748.pdf
    • https://cdn.shopify.com/s/files/1/0432/3603/2680/files/52232513076.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/kimozuvivetolef.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_off00005db4.bin
6cb0ee44bd807858584e7d9620ca595cbd862501ecce74838359492fa5427688
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 5604 bytes
font_01_sfnt_off00007097.bin
17bf881799bfdb5bede1b8407bcfffeeaa97b3e6b1366c4ac60305acf9017abe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7097 10332 bytes
font_02_sfnt_off000093ed.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x93ED 16092 bytes