Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f0892c27ba095c…

MALICIOUS

PDF

37.6 KB Created: 2020-08-19 08:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b2cb69ae9513f4d721740f4ac8f048 SHA-1: 9650312229a787f5a742646522d9af39f1634a42 SHA-256: b4f0892c27ba095c165cf7d724ffc5a9b6c710cb3b5dfb05976fc5e3478a21e3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=avery+label+template+8163+word`. This link is presented within the document body, disguised as a label template, to entice users to click. The presence of numerous other links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. 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.cc/pify?keyword=avery+label+template+8163+word
    • http://dozosa.uusantafe.org/uploads/1/3/1/3/131383483/galejuniwapo.pdf
    • http://files.rationingearth.com/uploads/1/3/0/7/130776499/sovorufo-femetizuduxe-fekixugalewedu.pdf
    • http://files.comcomnetworksw.com/uploads/1/3/1/1/131163867/5685308b2c.pdf
    • http://jizetut.megremedialmassage.com/uploads/1/3/1/4/131482976/0ac91650.pdf
    • http://files.mellowrootherbals.com/uploads/1/3/1/4/131407080/6631292.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/ncoer_support_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/dojuxemanirebazubepudasad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/vodejepuzatirez.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/figatogitugegidub.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/marriage_registration_certificate_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/razibogevesel.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/vaimanika_shastra_book_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8042/files/sat_practice_test_3_answers_khan_academy.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7437/files/8797215418.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/diditizizonemubirilurom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/bilorekevifafozisifedexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/pofivi.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_off0000474d.bin
a5a23d8904f974b724daf73842168d9f79b3b67cad28c04ee9acdd20c153914f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x474D 5508 bytes
font_01_sfnt_off00005a21.bin
780aa5c9b229a651d3dd4f6b09c50daa05b953423d37a5de8bd5fd72bf18cbec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 9664 bytes
font_02_sfnt_off00007b49.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B49 4324 bytes

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