Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef748ece9b6f06c…

MALICIOUS

PDF

45.9 KB Created: 2020-09-04 04:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96a8ae3d4f0edad3006d4e7c9ca1868 SHA-1: 67c2bdbcd20f8821b5311f3a23f9662d8ec26763 SHA-256: 9ef748ece9b6f06cd2514eadc86d5edc015dee074c6b9480b5e233042d962321
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that is part of a link farm. The document body contains the same malicious URL and appears to be a lure for free coloring sheets, intended to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=free+alphabet+coloring+sheets+for+preschoolers
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/xazaguvos.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/ganewolubopoz.pdf
    • https://cdn.shopify.com/s/files/1/0459/8146/6791/files/97702448818.pdf
    • https://cdn.shopify.com/s/files/1/0433/4577/2698/files/zirulefaruvebuzuperufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/best_exposure_bracketing_android.pdf
    • https://static.usrfiles.com/ugd/a1fb72_0c06ef0a347e4a2980fcbe79799eaacc.pdf
    • https://static.usrfiles.com/ugd/a771bd_d1959b19452f439cbf0abc70c7080814.pdf
    • https://static.usrfiles.com/ugd/8ab72e_66fcb1181a6b4c6f9323b319b2b6cc45.pdf
    • https://static.usrfiles.com/ugd/eda9ba_7d241ae0db2c4aa0b67172f2ea6fd249.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/bomugirepewijekusiwal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7824/4765/files/4795847169.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/earth_s_rotation_seasons_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/chainsmokers_closer_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/lonawizobadekuliji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/sundry_debtors_and_creditors_in_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/napikavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipudakafadaned.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/mataweroga.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_off00006be1.bin
aec5977400551069d305db8cf15427b5e4ab0653800f9f9d873eddc99c8254da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 5372 bytes
font_01_sfnt_off00007e18.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 1800 bytes
font_02_sfnt_off000086a6.bin
fceed3505517cc40057fb61d813d03e0690e6cd728a3c954b6eaa8bb95d94f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A6 10316 bytes

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