Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8d939c1160aff4…

MALICIOUS

PDF

83.1 KB Created: 2020-08-22 04:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f59ba0cebd8821db1ebb198cbe520c18 SHA-1: 8db25c60883d0b20b3de34191a2bea00864bbec0 SHA-256: da8d939c1160aff4a8868e2f75dfb542ae33d9fee638aa50505da59830e2235a
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a large number of external links, including a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=cross-+tail+current+sheet'. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious links broadly. The document body, though heavily obfuscated, contains the redirector URL.

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=cross-+tail+current+sheet
    • http://files.positivenergyworks.com/uploads/1/3/1/4/131482819/mesapaneba.pdf
    • http://files.porkypink.com/uploads/1/3/1/4/131453725/4000957.pdf
    • http://rubuvom.marylendway.com/uploads/1/3/2/6/132696212/zufape.pdf
    • http://revizew.storiasia.com/uploads/1/3/1/8/131871390/6232272.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/weekdays_in_a_year.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/bascule_jk_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/butterfly_valve_working.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/92849539637.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/force_table_lab_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0450/8984/9509/files/o_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0437/0871/1080/files/wufasomesugejobog.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/yamaha_rx-_v675_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/dixisirani.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/vehicle_information_app_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/datawuvezojoritufexaf.pdf
    • https://cdn.shopify.com/s/files/1/0465/4576/4510/files/one_way_anova_journal.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/nefinalatapusig.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_off0000e57e.bin
13ab1c388c66d223e73b4646a71784eafa302806350224c5a1ea3faeb58cb165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 4824 bytes
font_01_sfnt_off0000f5d9.bin
545162facb80ab693ab133fbd76d5a902226206de2cfff82b7d2b4a92b8735d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 10992 bytes
font_02_sfnt_off00011b65.bin
1545d8d18d5da848aa6978699bd75987b39e0b9bafe8fd318f800e33faf1bc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 16120 bytes
font_03_sfnt_off00013053.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 4324 bytes

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