Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d38086b8b5b87f1…

MALICIOUS

PDF

47.5 KB Created: 2020-08-16 12:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd1621e28431b3c4398fc5f5525eeb5 SHA-1: 0c8ac773dc7a617d3c54edf052b84c9e432e898d SHA-256: 5d38086b8b5b87f1f1da6174a1677d2461eeb98adcdcc559a5505b264e19ee36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the target URL which is presented as a 'Libreoffice user manual template'. This suggests a social engineering lure to trick users into clicking the malicious link, likely leading to further malware download or exploitation.

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=libreoffice+user+manual+template
    • http://files.bigbuckssupply.com/uploads/1/3/0/7/130740429/lixajapujofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3319/6706/files/pawiduwiwara.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/wixafazinafigarinatini.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3610/files/lewejezogide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/bandhan_bank_account_closure_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/66740705981.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/tepobudataka.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/zolajerefixabege.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/54472501481.pdf
    • https://cdn.shopify.com/s/files/1/0439/0646/5947/files/75551129789.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/alfresco_open_source_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/47758195190.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/kukodaguxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6785/files/61256889526.pdf
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/96490892336.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000680b.bin
62116e75cd379f3210977005ab3a989a7714be2b6c3e55052ef092f237757168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680B 5240 bytes
font_01_sfnt_off000079c7.bin
941ca848b74fdd797ffc51a1263c047441067d17d0bb0d74c74582d9af1737dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 10004 bytes
font_02_sfnt_off00009c40.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C40 16060 bytes

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