Malicious PDF — malware analysis report

Static analysis result for SHA-256 21326588dbfcebab…

MALICIOUS

PDF

43.5 KB Created: 2020-08-20 08:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fabbc9fa53dc0838cd57e29c0d908f50 SHA-1: fac4b3315ddcec38c0dee3b27fca7f2c8581e047 SHA-256: 21326588dbfcebabe2c4cbb7707f72a30896f22a2053b6f1b54b104b08a6b497
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and a URL pointing to a redirector, suggesting an attempt to lure users to malicious sites or manipulate SEO. The presence of numerous external links, including one to a known malicious redirector, indicates a likely attempt to distribute malware or phish for information.

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=attentive+noun+form
    • http://sisil.suisunvalleyfillingstation.com/uploads/1/3/1/3/131383629/3461190.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/peraxituvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/jopivukitulizi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/bhagavad_gita_gujarati_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0591/files/wujokenazisufulobe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/6466190337.pdf
    • https://cdn.shopify.com/s/files/1/0431/9019/0248/files/lovisitivoterewokivetovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/98206600795.pdf
    • https://cdn.shopify.com/s/files/1/0433/8964/9054/files/perufegifi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8419/9574/files/potion_of_lead_skin_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/ridewedejafutanarur.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/honey_maid_graham_crackers_ingredients.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/mesin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8065/files/tovetok.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_off00005706.bin
097b7ece6ac0f7c5920e96e6c957fd3240521bf5e099f32605de1a40534e0090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5706 4544 bytes
font_01_sfnt_off0000666d.bin
c204fea2acdcab526b04771439641be6e02b66bb5c87f48e0b4249572cf479ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666D 10720 bytes
font_02_sfnt_off00008b15.bin
73f6f760a67782f27700c3ed047511a210a1e3765a9cc4fd416c63ff6a2522af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B15 16060 bytes

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