Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c831cab74eb45e…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 02:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3d806a2165db8ad6aad58bc68222b4 SHA-1: 482c03bb3080173bbfcb60662a06257e009182f5 SHA-256: e8c831cab74eb45ec78f87cada2b1c0c715282de406045fa5633dfc13e838301
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link and a large number of embedded links, many pointing to Shopify domains. The document body, though heavily obfuscated, contains text related to 'phlebotomy practice test questions' and the malicious URL. This suggests a phishing or scam attempt designed to redirect users to malicious content.

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/wix?keyword=phlebotomy+practice+test+questions+and+answers
    • https://static.usrfiles.com/ugd/0df15e_cd7a3867b12e48569ce2a9e00f55fe42.pdf
    • https://static.usrfiles.com/ugd/1a89c8_1eb8e0b324c245d4ac36144aee9cce71.pdf
    • https://static.usrfiles.com/ugd/e3325f_ca69044963e941c4ab297e9f2d2026fd.pdf
    • https://static.usrfiles.com/ugd/5be868_ccd9bd14a8f047acaa73a87f87b00227.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/bolirukixogusejiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/exercices_orthographe_college.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/65736629151.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/24809617754.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/46296999551.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/bomba_de_hiroshima_y_nagasaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/what_does_the_mending_enchantment_do.pdf
    • https://static.usrfiles.com/ugd/d01287_688b9a3a73f640c08564e2bc4daa6736.pdf
    • https://static.usrfiles.com/ugd/824332_793d717021f44155a586df694653dc0b.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_off00006fb9.bin
00ce0f9cb875f22ea55f50001cbacd70d3b30873e0592a943b524aeaf5df8e8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 5656 bytes
font_01_sfnt_off000082cc.bin
5ffc9ad2f906ba8b32f8187eb3fd494cfec568affc42ea8eac4c72326cabebb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 10308 bytes
font_02_sfnt_off0000a612.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA612 4324 bytes