Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8d445fa9d1f9ab…

MALICIOUS

PDF

45.2 KB Created: 2020-08-17 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77258a75ce15b4e216785c543059304 SHA-1: f9509df65b8a3d78fbe26d2398ee2ce3801d0fef SHA-256: 7a8d445fa9d1f9abcf2cb0622b34e8f8f271f8f4a12a67cdf29647f3ba1b0197
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to a known malicious redirector. The redirector URL is 'https://ttraff.com/pify?keyword=powered+by+android+screen+stuck'. The presence of a large number of external links, many hosted on Shopify, suggests an attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=powered+by+android+screen+stuck
    • http://gifake.dceoralhistoryproject.org/uploads/1/3/0/7/130739845/98ab0ce00eeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/98705845798.pdf
    • https://cdn.shopify.com/s/files/1/0437/2991/1957/files/wintrobe_s_clinical_hematology_12th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/gesupozomorul.pdf
    • https://cdn.shopify.com/s/files/1/0441/0589/1992/files/chilton_manual_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8825/files/nubunirarudovekif.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/starcraft_zerg_units.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/arduino_uart_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0451/5794/1402/files/arnold_toynbee.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/92960228486.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/16866494254.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/tubosukaguvijesajipifur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/kosego.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/85676466682.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/bufisana.pdf
    • https://cdn.shopify.com/s/files/1/0430/7766/4929/files/61694474824.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_off00006402.bin
167bdaec7bfd8aa3d4365fe2215bf967325bd61181a14e1ab816d93e67f1fc52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 5184 bytes
font_01_sfnt_off000075c3.bin
997fea4b524c4e7b4bdc24dff8862d334fb545fe97bc5d6fc2591f2711f64c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 10464 bytes
font_02_sfnt_off00009982.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9982 4324 bytes

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