Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2cb16ff20d63ab…

MALICIOUS

PDF

71.4 KB Created: 2020-08-29 15:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 807ae3f197b3163e2620eee7b11a5f3f SHA-1: 79a48ca3c875508ced64615116f4814f3886abce SHA-256: 0b2cb16ff20d63ab2a79a55b98cf82e90fac1ce7f8fd6c0a656e16be94e46208
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to external PDF files, indicating a link farm strategy. One of the primary links, 'https://ttraff.cc/wix?keyword=ombra+mai+fu+pronunciation', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this malicious URL and several benign-looking Shopify URLs, suggesting a lure or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=ombra+mai+fu+pronunciation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0437/2329/2840/files/difference_between_inflectional_and_derivational_affixes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/lapububevizuzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/50691271075.pdf
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/map_of_world_oceans_and_seas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9460/5975/files/durefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3703/8491/files/read_the_game_penetrating_the_secret_society_of_pickup_artists_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/antrenmanlarla_matematik_tyt_yeni_nesil.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/basic_medical_terminology_prefixes_and_suffixes.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/99879973906.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/alphagan_p_davis.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off0000e2f0.bin
e43eb858545a4d9b6abacc8c33ec9501d2ae64a4dc3cc092ef357486bb4e7a32		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE2F0 18176 bytes
font_00_sfnt_off0000607a.bin
c5c41b21a7aafde7b27be626e0b728f87188f17961ccb7c28355bd63c29eb0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 5588 bytes
font_01_sfnt_off00007409.bin
d578312a8a268cef6eabd1a5047c5ff6f85f9db246f8541108a9773a220f7fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7409 5116 bytes
font_02_sfnt_off0000854c.bin
1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854C 2656 bytes
font_03_sfnt_off00009053.bin
6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9053 2328 bytes
font_04_sfnt_off00009b09.bin
b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B09 2108 bytes
font_05_sfnt_off0000a4d4.bin
c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D4 6640 bytes
font_06_sfnt_off0000b673.bin
1e4ed958e4abada4f9a2ed0f665644cbdca8da8d306fed02045b6c97fc1f923e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB673 13912 bytes
font_08_sfnt_off0000ffbc.bin
333cf0bae5291019b79d77a37696b89786718dc77a0e6f1c7356514a48765311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 3276 bytes

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