Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc77c5faaa13da19…

MALICIOUS

PDF

49.1 KB Created: 2020-08-13 22:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dbe45ebb6632b5b3db2777e21fda352 SHA-1: f59b894ed364e52d7aa320c5e10e1ad8313acab7 SHA-256: cc77c5faaa13da19697204bdb5ecb0c4b5922846a99295677261e4b767c6ed82
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at `https://ttraff.ru/pify?keyword=como+buscar+con+fotos+en+google+android`. The document body, though heavily obfuscated, contains this same malicious URL, indicating the primary intent is to lure the user to this external site. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=como+buscar+con+fotos+en+google+android
    • http://wemobo.eutropiatours.com/uploads/1/3/0/7/130775997/651757.pdf
    • http://files.thesefeetwilltravel.com/uploads/1/3/0/8/130813965/sonidoruribanupe.pdf
    • http://situviwu.simpsonchorus.com/uploads/1/3/1/0/131070161/dagabo-gadixazito-pebujapoxob-xabumaxivu.pdf
    • http://xovajexa.appgeogconf.org/uploads/1/3/1/3/131384260/jomegakuv-fizugubedewujax-xikiladebot-taxoxojida.pdf
    • http://gukutuko.panamany.com/uploads/1/3/1/6/131607163/989687c1a9fc.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/32670011423.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/zujomuvejudikem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridikesomuzumiburowafex.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/45789317581.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/human_anatomy_vol_1_upper_limb_and_thorax.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/vivegagimezumobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/zombie_minecraft_skin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/8749253351.pdf
    • https://cdn.shopify.com/s/files/1/0428/7633/8335/files/html_codes_list_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/vomobijosasizibeterojisub.pdf
    • https://cdn.shopify.com/s/files/1/0450/6664/9750/files/basic_question_of_f_b_service.pdf
    • https://cdn.shopify.com/s/files/1/0435/6574/4287/files/adjectives_and_adverbs_test.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d3.bin
6bcb3e1ea64f76ef50819b3890c04b38366e7d8d475fbeb663b6084c8ae6adb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 3360 bytes
font_01_sfnt_off00006eef.bin
34bca9ac147851da58faec84ba9f557433495f5b2b419a7e9e199df93e1bd009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEF 5384 bytes
font_02_sfnt_off00008125.bin
93b4c3f316e3bf3d4ecbee8e43fce2c5c1fda07d04b3a4fae7adb21a1a77b530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8125 11560 bytes
font_03_sfnt_off0000a6bd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BD 4324 bytes

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